Question

What is the variance if the first 9 multiples of 7

Answer 1

Answer:

326.67

Step-by-step explanation:

see below link for detail calculation

Answer 2

We must recall that:

A multiple in math are the numbers you get when you multiply a certain number by an integer.

Given: First 9 multiple of 7

$7,14,21,28,35,42,49,56,63$

Mean $=\frac{SumOfObservation}{TotalNo.OfObservation}$

$=\frac{7+14+21+28+35+42+49+56+63}{9}$

Mean $\bar{x}$ $=35$

Finding variance:

$\sum (x_i-\bar{x})^2=2940$

Variance $(\sigma)^2=\frac{\sum(x_i-\bar{x})^2}{n}=\frac{2940}{9}=326.66$