Question

the resting heart rates for a sample of 15 students are recorded in the following stemplot. what is the mean resting heart rate for this sample? 66.0 beats per minute 69.0 beats per minute 69.9 beats per minute 70.0 beats per minute heart rates 5|5 6|3 6|5 9 9 9 9 7|0 1 3 3 4 7|5 6 7 key: 7|5 = 75 beats per minute

Explanation:

Step1: List out all data

From the stemplot, the data values are: \(55,63,65,69,69,69,69,70,71,73,73,74,75,76,77\)

Step2: Calculate the sum of data

$$
LATEXBLOCK0
$$

Step3: Calculate the mean

The formula for the mean \(\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}\), where \(n = 15\) and \(\sum_{i=1}^{n}x_{i}=1048\)
\(\bar{x}=\frac{1048}{15}\approx69.9\)

Answer:

69.9 beats per minute