Textbook ExpertVerified Tutor
12 Nov 2021
Given information
Given that, four friends, Janice, Barbara, Kathy, and Roberta, decided to carpool together to get to school. Each day the driver would be chosen by randomly selecting one of the four names. They carpool to school for 96 days. Use the normal approximation to the binomial to calculate the following probabilities. Round the standard deviation to four decimal places.
We have to find the probability that Janice is the driver at most 20 days.
Step-by-step explanation
Step 1.
From the above-given information, we have
And
Since we use normal approximation with a mean and standard deviation
So,
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