Question

find the average of


all odd numbers between 20 and 50



​

Answer 1

Answer:

35

Step-by-step explanation :

so the odd numbers between 20 and 50 are 21,23,25,27,29,31,33,35,37,39,41,43,45,47,49

and there are 15 of them

average =sum of numbers divided by the no of them

=35

Answer 2

Answer:

35

Step-by-step explanation:

Concept= Sum of series and Average

Given= Series of odd numbers

To find= Average

Explanation=

We have to find the  average of all numbers between 20 and 50.

To find average, average=sum of series/number of observation

Here we need to find the sum of odd numbers between 20 and 50 and the count of numbers first.

Odd numbers between 20 and 50 are 21, 23, 25, 27, 29,31, 33, 35, 37, 39,41,43, 45, 47,49.

Then applying formulas of sum of series we have

a= 21, d=2, l=49.

l= a+(n-1)d

49 = 21+ (n-1)2

28= (n-1)2

n=15.

The count of odd numbers between 20 and 50 is 15.

Sum= (a+l)n/2

=> (21+49)15/2

=> 35*15

=> 525

Average= 525/15= 35

Therefore, the average of odd numbers between 20 and 50 is 35.

#SPJ2