Question

Use the table to write and solve an equation to find the number of

Answer 1

Answer:

$c = 11$

Step-by-step explanation:

Given

$Cars\ Sold:-: 8; 9; 12; c$

Required

What value of c makes the mean = 10

Mean is calculated as

$Mean = \frac{\sum x}{n}$

In this case;

Mean = 10 and n = 4;

So, we have:

$10 = \frac{8+ 9 + 12 + c}{4}$

$10 = \frac{29+ c}{4}$

Multiply both sides by 4

$10 * 4 = 29 + c$

$40 = 29 + c$

Solve for c

$c = 40 - 29$

$c = 11$