Service time for a customer coming through a checkout counter in a retail store is a random variable with the mean of 3.5 minutes and standard deviation of 0.5 minutes. Suppose that the distribution of service time is fairly close to a normal distribution. Suppose there are two counters in a store, n₁ = 21 customers in the first line and n₂ = 28 customers in the second line. Find the probability that the difference between the mean service time for the shorter line X, and the mean service time for the longer one X₂ is more than 0.5 minutes. Assume that the service times for each customer can be regarded as independent random variables.

A First Course in Probability (10th Edition)
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Author:Sheldon Ross
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Service time for a customer coming through a checkout counter in a retail store is a random variable with the mean of 3.5 minutes and
standard deviation of 0.5 minutes. Suppose that the distribution of service time is fairly close to a normal distribution. Suppose there
are two counters in a store, n₁ = 21 customers in the first line and n₂ = 28 customers in the second line. Find the probability that the
difference between the mean service time for the shorter line X₁ and the mean service time for the longer one X₂ is more than 0.5
minutes. Assume that the service times for each customer can be regarded as independent random variables.
Round your answer to two decimal places (e.g. 98.76).
P = i
Transcribed Image Text:Service time for a customer coming through a checkout counter in a retail store is a random variable with the mean of 3.5 minutes and standard deviation of 0.5 minutes. Suppose that the distribution of service time is fairly close to a normal distribution. Suppose there are two counters in a store, n₁ = 21 customers in the first line and n₂ = 28 customers in the second line. Find the probability that the difference between the mean service time for the shorter line X₁ and the mean service time for the longer one X₂ is more than 0.5 minutes. Assume that the service times for each customer can be regarded as independent random variables. Round your answer to two decimal places (e.g. 98.76). P = i
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