Question

gwendelyn, who is a witch, went on an international witch tour. the following table shows the number of spells that she cast in each country. country number of spells brazil 1 argentina 5 russia 5 australia 1 find the mean number of spells cast. spells

Explanation:

Step1: Sum the number of spells

To find the mean, first we sum all the number of spells. The number of spells are 1 (Brazil), 5 (Argentina), 5 (Russia), and 1 (Australia). So the sum is $1 + 5 + 5 + 1$.
Calculating that: $1+5 = 6$, $6 + 5 = 11$, $11 + 1 = 12$.

Step2: Divide by the number of countries

There are 4 countries. The formula for the mean $\bar{x}$ is $\bar{x}=\frac{\text{Sum of values}}{\text{Number of values}}$. So we divide the sum (12) by 4.
$\frac{12}{4}=3$.

Answer:

3