In a shopping mall an average of 3 out of every 5 customers use visa credit...

In a shopping mall an average of 3 out of every 5 customers use visa credit cards. A sample of 10 customers is selected.
1. Find the probability that exactly 6 customers use visa credit card.
2. Find the probability that less than 9 customers use visa credit card.
3. Now assume that a sample of 50 customers are selected. Find the smallest value of n such that P(X<n) ≥ 0.9, where the random variable X represents the number of customers who uses visa credit card.

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Expert Solution

The solution is done showing all steps with calculations and required formulas. For better understanding, a z-table is also attached. Hope you can understand.

z-table :

orchestra answered 1 year ago

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