unit 4 - mean, median and mode, and\nthe following pulse rates were recorded for a group of 15 students. how…
unit 4 - mean, median and mode, and\nthe following pulse rates were recorded for a group of 15 students. how many pulse rates were lower than the mean?\n84, 74, 87, 68, 82, 68, 71, 75, 65, 62, 75, 74, 66, 82, 62\nthere were pulse rates lower than the mean.\n(type a whole number.)
Answer
Explanation:
Step1: Calculate the mean
The mean $\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}$, where $n = 15$ and $x_{i}$ are the pulse - rates. $\sum_{i=1}^{15}x_{i}=84 + 74+87+68+82+68+71+75+65+62+75+74+66+82+62=1089$. $\bar{x}=\frac{1089}{15}=72.6$.
Step2: Count the number of pulse - rates lower than the mean
The pulse - rates lower than 72.6 are 68, 68, 71, 65, 62, 62, 74, 66, 62. There are 9 such values.
Answer:
9