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Chapter 1: Q 88. (page 75)

Pulse rates Here are data on the resting pulse rates (in beats per minute) of 19 middle school students:

(a) Calculate the mean. Show your work.

(b) The student with a 120 pulse rate has a medical issue. Find the mean pulse rate for the other 18 students. What property of the mean does this illustrate?

Short Answer

Expert verified

Part (a) 81.2105

Part (b) 79.0556, non-resistant property

Step by step solution

01

Part (a) Step 1. Given information.

The given data is shown below:

02

Part (a) Step 2. Find the mean.

n=19x¯=∑i=1nxin=71+104+76+88+78+71+68+86+70+90+74+76+69+68+88+96+68+82+12019=154319≈81.2105

The mean is 81.205 beats per minute.

03

Part (b) Step 1. Find the mean pulse rate for the other 18 students.

It is given that The student with a 120 pulse rate has a medical issue. So we have to calculate the mean of the other 18 students.

n=18x¯=∑i=1nxin=71+104+76+88+78+71+68+86+70+90+74+76+69+68+88+96+68+8219=142318≈79.0556

This shows the property of mean named non-resistant property because the mean is influenced by the student with a 120pulse rate per minute.

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