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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