In: Statistics and Probability
Exhibit 5-4
A local bottling company has determined the number of machine breakdowns per month and their respective probabilities as shown below.
| 
 Number of  | 
||
| 
 Breakdowns  | 
 Probability  | 
|
| 
 0  | 
 0.12  | 
|
| 
 1  | 
 0.38  | 
|
| 
 2  | 
 0.25  | 
|
| 
 3  | 
 0.18  | 
|
| 
 4  | 
 0.07  | 
Refer to Exhibit 5-4. The expected number of machine breakdowns per month is?
2. The probability of at least 3 breakdowns in a month is
3. The probability of no breakdowns in a month is
4.The expected number of new clients per month is
5. The variance is
6. The standard deviation is