The manager of a grocery store has taken a random sample of 100 customers. the average length of time it took these 100 customers to check out was 3 minutes. it is known that the standard deviation of the population of checkout times is 1 minute. the standard error of the mean equals?

The standard error of the mean equals 0.1            

Step-by-step explanation:

We are given the following in the question:

Sample mean, = 3 minutes

Sample size, n = 100

Population standard deviation, σ = 1 minute

Formula:

Thus, standard error of the mean equals 0.1

yes. we do proportions in probabilities.

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify