Question

Asked Dec 2, 2019

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The amount of coffee that people drink per day is normally distributed with a mean of 17 ounces and a standard deviation of 7 ounces. 35 randomly selected people are surveyed. Round all answers to 4 decimal places where possible.

Find the IQR for the average of 35 coffee drinkers.

Q1 = ounces

Q3 = ounces

IQR: ounces

Can you show the process on a ti84

Step 1

The standard deviation for 35 people is,

σ/ √n=7/ √35=1.1832

Q1 is the 25^{th} percentile and Q3 is the 75^{th} percentile.

The value of Q1 is **16.2019**, which is obtained by using below steps

- Press 2
^{nd}VARS - Select invNorm(
- Enter
- Type (0.25,17,1.1832)
- Enter

Output obtained by Ti 83 calculator is given below:

Step 2

The value of Q2 is **17.7981**, which is obtained by using below steps

- Press 2nd VARS
- Select invNorm(
- Enter
- Type (0.75,17,1.1832)...

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