what is the mean of this set: {2, 6, 7, 9, 9, 9}?\n6\n7\n8\n9

Explanation:

Step1: Find sum of elements

$2 + 6+7 + 9+9+9=42$

Step2: Count number of elements

There are 6 elements in the set.

Step3: Calculate the mean

The mean $\bar{x}=\frac{42}{6}=7$

Answer:

B. 7