Question

1-1 mean, median, and mode exam
find the mean of the follow data
12, 14, 18, 13, 22, 25, 99
o 28
o 29
o 30
o 29.5

Explanation:

Step1: Recall mean formula

The mean $\bar{x}$ of a data - set $x_1,x_2,\cdots,x_n$ is given by $\bar{x}=\frac{\sum_{i = 1}^{n}x_i}{n}$, where $\sum_{i=1}^{n}x_i$ is the sum of the data values and $n$ is the number of data values.

Step2: Calculate the sum of data values

Here, $x_1 = 12,x_2=14,x_3 = 18,x_4=13,x_5 = 22,x_6=25,x_7 = 99$. Then $\sum_{i=1}^{7}x_i=12 + 14+18+13+22+25+99=203$.

Step3: Determine the number of data values

The number of data values $n = 7$.

Step4: Calculate the mean

$\bar{x}=\frac{203}{7}=29$.

Answer:

B. 29