Question

these data are the number of junk e - mails lena received for 9 consecutive days. 61 1 1 3 4 28 16 5 9. find the range, mean, and standard deviation. round the mean to one decimal place and the standard deviation to two decimal places, if necessary. part 1 of 3 the range is 60 e - mails. part: 1 / 3 part 2 of 3 the mean is e - mails. (round the answer to one decimal place, if necessary.)

Explanation:

Step1: Recall mean formula

The mean $\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}$, where $x_{i}$ are data - points and $n$ is the number of data - points. Here, $n = 9$ and the data set is $\{61,1,1,3,4,28,16,5,9\}$.

Step2: Calculate the sum of data

$\sum_{i = 1}^{9}x_{i}=61 + 1+1+3+4+28+16+5+9=128$.

Step3: Calculate the mean

$\bar{x}=\frac{128}{9}\approx14.2$.

Answer:

$14.2$