Q1) Door-to-door sales person for Household appliance has learned from her past experience that out of 10 demonstrations of her appliance only 4 result in actual sales (long run average). This week she requires making at least 5 sales. At least how many demonstrations does she require to do to ensure that probability of meeting her target is at least 90 percent?
2) If probability distribution of X is:
|
X
|
P(X)
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|
3
|
1/8
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4
|
1/8
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|
5
|
3/8
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|
6
|
3/8
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Determine the variance of X? (Illustrate your computation either in Table or in Equation form)