In: Statistics and Probability
A bank’s daily withdrawals and deposits over the last 12 months is indicated
a. What net deposit drain has a probability of 1.5%?
b. What net deposit drain has a probability of 2%?
c. What is probability of a one-day net deposit drain in excess of $30.00?
| deposits (000) | withdrawals (000) |
| 356 | 180 |
| 320 | 277 |
| 356 | 336 |
| 237 | 316 |
| 178 | 174 |
| 101 | 324 |
| 325 | 337 |
| 335 | 309 |
| 92 | 42 |
| 392 | 286 |
| 336 | 181 |
| 272 | 361 |
| 72 | 351 |
| 261 | 239 |
| 333 | 62 |
| 237 | 306 |
| 144 | 254 |
| 109 | 153 |
| 320 | 45 |
| 75 | 199 |
| 371 | 265 |
| 346 | 203 |
| 353 | 177 |
| 229 | 146 |
| 293 | 75 |
| 182 | 340 |
| 194 | 52 |
| 135 | 51 |
| 333 | 79 |
| 368 | 322 |
| 175 | 129 |
| 172 | 175 |
| 261 | 351 |
| 274 | 156 |
| 66 | 266 |
| 60 | 125 |
| 326 | 82 |
| 190 | 212 |
| 287 | 62 |
| 90 | 355 |
| 395 | 105 |
| 91 | 226 |
| 148 | 292 |
| 393 | 218 |
| 99 | 152 |
| 271 | 161 |
| 158 | 49 |
| 107 | 367 |
| 309 | 252 |
| 144 | 284 |
| 117 | 373 |
| 367 | 58 |
| 313 | 155 |
| 153 | 128 |
| 348 | 166 |
| 268 | 156 |
| 120 | 135 |
| 52 | 97 |
| 322 | 239 |
| 290 | 307 |
| 332 | 169 |
| 50 | 305 |
| 275 | 109 |
| 233 | 92 |
| 126 | 270 |
| 236 | 223 |
| 184 | 273 |
| 85 | 105 |
| 107 | 127 |
| 161 | 173 |
| 317 | 282 |
| 122 | 209 |
| 170 | 59 |
| 280 | 300 |
| 50 | 374 |
| 218 | 359 |
| 52 | 197 |
| 71 | 198 |
| 53 | 159 |
| 280 | 354 |
| 114 | 321 |
| 196 | 77 |
| 189 | 306 |
| 266 | 134 |
| 328 | 180 |
| 224 | 127 |
| 263 | 93 |
| 139 | 96 |
| 137 | 266 |
| 160 | 84 |
| 339 | 190 |
| 332 | 342 |
| 289 | 173 |
| 231 | 114 |
| 155 | 198 |
| 128 | 105 |
| 125 | 349 |
| 117 | 66 |
| 231 | 169 |
| 208 | 318 |
| 389 | 291 |
| 339 | 269 |
| 366 | 50 |
| 336 | 323 |
| 177 | 300 |
| 281 | 375 |
| 62 | 329 |
| 122 | 357 |
| 120 | 152 |
| 379 | 341 |
| 340 | 335 |
| 324 | 74 |
| 166 | 331 |
| 351 | 179 |
| 291 | 330 |
| 393 | 187 |
| 97 | 215 |
| 347 | 256 |
| 199 | 337 |
| 176 | 362 |
| 146 | 131 |
| 378 | 111 |
| 355 | 338 |
| 348 | 233 |
| 242 | 281 |
| 86 | 327 |
| 186 | 334 |
| 151 | 245 |
| 92 | 148 |
| 122 | 354 |
| 206 | 309 |
| 282 | 319 |
| 148 | 45 |
| 230 | 65 |
| 211 | 206 |
| 251 | 211 |
| 313 | 352 |
| 364 | 57 |
| 202 | 337 |
| 291 | 42 |
| 352 | 161 |
| 112 | 298 |
| 236 | 53 |
| 333 | 151 |
| 363 | 67 |
| 292 | 294 |
| 268 | 306 |
| 299 | 155 |
| 317 | 121 |
| 73 | 182 |
| 146 | 294 |
| 251 | 236 |
| 376 | 185 |
| 70 | 367 |
| 197 | 298 |
| 221 | 334 |
| 297 | 284 |
| 94 | 64 |
| 276 | 264 |
| 301 | 210 |
| 253 | 57 |
| 242 | 344 |
| 256 | 84 |
| 108 | 149 |
| 82 | 98 |
| 56 | 365 |
| 135 | 204 |
| 389 | 258 |
| 223 | 326 |
| 54 | 282 |
| 301 | 337 |
| 207 | 261 |
| 191 | 147 |
| 334 | 130 |
| 279 | 256 |
| 223 | 271 |
| 238 | 161 |
| 89 | 89 |
| 178 | 348 |
| 205 | 311 |
| 151 | 40 |
| 84 | 230 |
| 265 | 67 |
| 217 | 367 |
| 391 | 142 |
| 280 | 73 |
| 62 | 190 |
| 270 | 267 |
| 298 | 139 |
| 302 | 120 |
| 278 | 369 |
| 176 | 68 |
| 78 | 194 |
| 125 | 343 |
| 348 | 64 |
| 251 | 172 |
| 138 | 350 |
| 94 | 291 |
| 371 | 197 |
| 188 | 208 |
| 92 | 150 |
| 397 | 226 |
| 336 | 62 |
| 335 | 325 |
| 109 | 269 |
| 377 | 147 |
| 95 | 242 |
| 338 | 119 |
| 378 | 350 |
| 305 | 65 |
| 240 | 155 |
| 123 | 74 |
| 340 | 122 |
| 270 | 234 |
| 316 | 72 |
| 106 | 289 |
| 142 | 303 |
| 109 | 58 |
| 128 | 170 |
| 225 | 287 |
| 127 | 352 |
| 135 | 51 |
| 226 | 314 |
| 317 | 366 |
| 146 | 187 |
| 190 | 54 |
| 295 | 312 |
| 93 | 288 |
| 98 | 349 |
| 213 | 192 |
| 269 | 45 |
| 61 | 48 |
| 243 | 182 |
| 336 | 147 |
| 370 | 214 |
| 329 | 302 |
| 166 | 219 |
| 132 | 56 |
| 61 | 282 |
| 334 | 84 |
| 113 | 176 |
| 190 | 283 |
| 60 | 210 |
| 388 | 157 |
| 96 | 87 |
| 300 | 128 |
| 350 | 202 |
| 391 | 215 |
| 253 | 274 |
| 246 | 142 |
| 297 | 365 |
| 102 | 360 |
| 130 | 149 |
| 374 | 250 |
| 62 | 372 |
| 348 | 337 |
| 118 | 46 |
| 135 | 320 |
| 252 | 246 |
| 201 | 106 |
ANSWER::
| deposits (000) | withdrawals (000) | Net deposit drain |
| 366 | 50 | -316 |
| 367 | 58 | -309 |
| 364 | 57 | -307 |
| 363 | 67 | -296 |
| 395 | 105 | -290 |
| 348 | 64 | -284 |
| 320 | 45 | -275 |
| 336 | 62 | -274 |
| 333 | 62 | -271 |
| 378 | 111 | -267 |
| 333 | 79 | -254 |
| 324 | 74 | -250 |
| 334 | 84 | -250 |
| 291 | 42 | -249 |
| 391 | 142 | -249 |
| 326 | 82 | -244 |
| 316 | 72 | -244 |
| 305 | 65 | -240 |
| 388 | 157 | -231 |
| 377 | 147 | -230 |
| 287 | 62 | -225 |
| 269 | 45 | -224 |
| 338 | 119 | -219 |
| 293 | 75 | -218 |
| 340 | 122 | -218 |
| 280 | 73 | -207 |
| 393 | 187 | -206 |
| 334 | 130 | -204 |
| 265 | 67 | -198 |
| 317 | 121 | -196 |
| 253 | 57 | -196 |
| 352 | 161 | -191 |
| 376 | 185 | -191 |
| 336 | 147 | -189 |
| 236 | 53 | -183 |
| 348 | 166 | -182 |
| 333 | 151 | -182 |
| 302 | 120 | -182 |
| 356 | 180 | -176 |
| 353 | 177 | -176 |
| 391 | 215 | -176 |
| 393 | 218 | -175 |
| 371 | 197 | -174 |
| 351 | 179 | -172 |
| 256 | 84 | -172 |
| 300 | 128 | -172 |
| 397 | 226 | -171 |
| 263 | 93 | -170 |
| 275 | 109 | -166 |
| 230 | 65 | -165 |
| 332 | 169 | -163 |
| 298 | 139 | -159 |
| 313 | 155 | -158 |
| 370 | 214 | -156 |
| 336 | 181 | -155 |
| 339 | 190 | -149 |
| 328 | 180 | -148 |
| 350 | 202 | -148 |
| 299 | 155 | -144 |
| 346 | 203 | -143 |
| 194 | 52 | -142 |
| 233 | 92 | -141 |
| 190 | 54 | -136 |
| 266 | 134 | -132 |
| 389 | 258 | -131 |
| 374 | 250 | -124 |
| 196 | 77 | -119 |
| 274 | 156 | -118 |
| 231 | 114 | -117 |
| 289 | 173 | -116 |
| 348 | 233 | -115 |
| 268 | 156 | -112 |
| 170 | 59 | -111 |
| 151 | 40 | -111 |
| 271 | 161 | -110 |
| 158 | 49 | -109 |
| 176 | 68 | -108 |
| 392 | 286 | -106 |
| 371 | 265 | -106 |
| 246 | 142 | -104 |
| 148 | 45 | -103 |
| 389 | 291 | -98 |
| 224 | 127 | -97 |
| 201 | 106 | -95 |
| 347 | 256 | -91 |
| 301 | 210 | -91 |
| 240 | 155 | -85 |
| 135 | 51 | -84 |
| 135 | 51 | -84 |
| 229 | 146 | -83 |
| 322 | 239 | -83 |
| 251 | 172 | -79 |
| 238 | 161 | -77 |
| 160 | 84 | -76 |
| 132 | 56 | -76 |
| 118 | 46 | -72 |
| 339 | 269 | -70 |
| 231 | 169 | -62 |
| 243 | 182 | -61 |
| 309 | 252 | -57 |
| 117 | 66 | -51 |
| 109 | 58 | -51 |
| 92 | 42 | -50 |
| 123 | 74 | -49 |
| 368 | 322 | -46 |
| 175 | 129 | -46 |
| 191 | 147 | -44 |
| 320 | 277 | -43 |
| 139 | 96 | -43 |
| 251 | 211 | -40 |
| 379 | 341 | -38 |
| 270 | 234 | -36 |
| 317 | 282 | -35 |
| 94 | 64 | -30 |
| 378 | 350 | -28 |
| 329 | 302 | -27 |
| 335 | 309 | -26 |
| 153 | 128 | -25 |
| 128 | 105 | -23 |
| 279 | 256 | -23 |
| 261 | 239 | -22 |
| 213 | 192 | -21 |
| 356 | 336 | -20 |
| 355 | 338 | -17 |
| 146 | 131 | -15 |
| 251 | 236 | -15 |
| 236 | 223 | -13 |
| 336 | 323 | -13 |
| 297 | 284 | -13 |
| 61 | 48 | -13 |
| 276 | 264 | -12 |
| 348 | 337 | -11 |
| 335 | 325 | -10 |
| 96 | 87 | -9 |
| 252 | 246 | -6 |
| 340 | 335 | -5 |
| 211 | 206 | -5 |
| 178 | 174 | -4 |
| 270 | 267 | -3 |
| 89 | 89 | 0 |
| 292 | 294 | 2 |
| 172 | 175 | 3 |
| 332 | 342 | 10 |
| 325 | 337 | 12 |
| 161 | 173 | 12 |
| 120 | 135 | 15 |
| 82 | 98 | 16 |
| 290 | 307 | 17 |
| 295 | 312 | 17 |
| 130 | 149 | 19 |
| 85 | 105 | 20 |
| 107 | 127 | 20 |
| 280 | 300 | 20 |
| 188 | 208 | 20 |
| 253 | 274 | 21 |
| 190 | 212 | 22 |
| 120 | 152 | 32 |
| 301 | 337 | 36 |
| 282 | 319 | 37 |
| 268 | 306 | 38 |
| 291 | 330 | 39 |
| 242 | 281 | 39 |
| 313 | 352 | 39 |
| 108 | 149 | 41 |
| 146 | 187 | 41 |
| 128 | 170 | 42 |
| 155 | 198 | 43 |
| 109 | 153 | 44 |
| 52 | 97 | 45 |
| 223 | 271 | 48 |
| 317 | 366 | 49 |
| 99 | 152 | 53 |
| 166 | 219 | 53 |
| 207 | 261 | 54 |
| 92 | 148 | 56 |
| 92 | 150 | 58 |
| 225 | 287 | 62 |
| 113 | 176 | 63 |
| 60 | 125 | 65 |
| 297 | 365 | 68 |
| 237 | 306 | 69 |
| 135 | 204 | 69 |
| 280 | 354 | 74 |
| 237 | 316 | 79 |
| 122 | 209 | 87 |
| 226 | 314 | 88 |
| 272 | 361 | 89 |
| 184 | 273 | 89 |
| 261 | 351 | 90 |
| 278 | 369 | 91 |
| 190 | 283 | 93 |
| 281 | 375 | 94 |
| 151 | 245 | 94 |
| 197 | 298 | 101 |
| 242 | 344 | 102 |
| 206 | 309 | 103 |
| 223 | 326 | 103 |
| 53 | 159 | 106 |
| 205 | 311 | 106 |
| 73 | 182 | 109 |
| 144 | 254 | 110 |
| 208 | 318 | 110 |
| 221 | 334 | 113 |
| 78 | 194 | 116 |
| 189 | 306 | 117 |
| 97 | 215 | 118 |
| 177 | 300 | 123 |
| 75 | 199 | 124 |
| 71 | 198 | 127 |
| 62 | 190 | 128 |
| 137 | 266 | 129 |
| 91 | 226 | 135 |
| 202 | 337 | 135 |
| 199 | 337 | 138 |
| 144 | 284 | 140 |
| 218 | 359 | 141 |
| 148 | 292 | 144 |
| 126 | 270 | 144 |
| 52 | 197 | 145 |
| 84 | 230 | 146 |
| 95 | 242 | 147 |
| 186 | 334 | 148 |
| 146 | 294 | 148 |
| 217 | 367 | 150 |
| 60 | 210 | 150 |
| 182 | 340 | 158 |
| 109 | 269 | 160 |
| 142 | 303 | 161 |
| 166 | 331 | 165 |
| 178 | 348 | 170 |
| 106 | 289 | 183 |
| 135 | 320 | 185 |
| 176 | 362 | 186 |
| 112 | 298 | 186 |
| 93 | 288 | 195 |
| 94 | 291 | 197 |
| 66 | 266 | 200 |
| 114 | 321 | 207 |
| 138 | 350 | 212 |
| 125 | 343 | 218 |
| 61 | 282 | 221 |
| 101 | 324 | 223 |
| 125 | 349 | 224 |
| 127 | 352 | 225 |
| 54 | 282 | 228 |
| 122 | 354 | 232 |
| 122 | 357 | 235 |
| 86 | 327 | 241 |
| 98 | 349 | 251 |
| 50 | 305 | 255 |
| 117 | 373 | 256 |
| 102 | 360 | 258 |
| 107 | 367 | 260 |
| 90 | 355 | 265 |
| 62 | 329 | 267 |
| 72 | 351 | 279 |
| 70 | 367 | 297 |
| 56 | 365 | 309 |
| 62 | 372 | 310 |
| 50 | 374 | 324 |
a. What net deposit drain has a probability of 1.5%
Total count = 260
Count = 0.015 * 260 = 3.9
Net deposit drain > -296
b. What net deposit drain has a probability of 2%?
Total count = 260
Count = 0.02* 260 = 5.2
Net deposit drain > -284
c. What is probability of a one-day net deposit drain in excess of $30.00
= 104/260
= 0.4
40%
Please revert back in case of any doubt.
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