Question

Asked Nov 19, 2018

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Step 1

We have been given that a waitress keeps a track of the tips that she earns and knows that her mean tip is 15% with a standard deviation of 4%. She uses this information to create a sampling distribution with samples of size 50. We need to determine the probability that a sample of tips will have a mean between 14% and 15.5%. We will use normal distribution to determine the required probability.

Our first step is to find the z scores corresponding to the values x=14% and x = 15.5%.

Step 2

We will use the formula for z score as shown below to find the values of z scores corresponding to x = 14% and x = 15.5%

Step 3

z score corresponding to x = 1...

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