Question

Find the arithmetic mean an of an-1 = 3.9 and an+1 = 7.1

a. 11
b. 5.5
c. 3.7
d. 1.6

Answer 1

b. 5.5

Explanation:

FOR LEARNING ONLY.. not necessary to read, but I hope it helps!

you start with:

`a_(n-1)=3.9\\a_(n-1)=7.1`

arithmetic questions like this are like finding an average.

so you add the values while dividing by the total of values there are.

in this case:

`(7.1+3.9)/(2)`

which is simplified to:

`(11)/(2)`

then decimal:

`5.5`

Answer 2

Explanation:

Alright, lets get started.

We are asked to find arithmetic mean of two terms given.

For finding arithmetic mean, we add up the values and divide the sum by the number of values.

Here we have given two numbers , below

`a_(n-1)=3.9`

`a_(n+1)=7.1`

So, mean of these two numbers will be =
`(3.9+7.1)/(2)`

So, mean of these two numbers will be =
`(11)/(2)=5.5`

So, arithmetic mean for given two numbers are 5.5 : Answer (b)

Hope it will help :)