What is the average of all numbers between 8 and 74 which are divisible by 7?

What is the average of all numbers between 8 and 74 which are divisible by 7?
1). 40
2). 41
3). 42
4). 43

4 answers

0 vote

Answered by Guest on 2018-01-28 05:30:11 | Votes 0 | #

I am not sure, may be 41 is correct

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44 vote

Answered by Guest on 2018-01-30 20:18:17 | Votes 44 | #

No.of terms= (last term-first term)/d -1 =(70-14)/7 -1 =9 Sum=n/2 (last term +first term) 9/2 (84) Avg=(9×84)/(2×9) =42

0 vote

Answered by Guest on 2018-03-13 21:45:39 | Votes 0 | #

All the numbers between 8 & 74 which are divisible by 7 is... 1st = 14 last = 70 Average:- (1st number+last number)/2 =(14+70)/2 =84/2 = 42

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vineeth · Accepted Answer · 2018-06-09 22:32:52

sum of n terms is n/2(2a+(n-1)d) .............(formula) n is number of terms a is first term d is difference between first two cosecutive numbers numbers between 8 to 74 which is divisible by 7 is 7 table sequence is 14 21 28 35 42 49 56 63 70 now apply formula n is 9 terms a is 14 and d is 7 sum of terms is 9/2(2(14)+(8)7) =4.5(84) =378 average is 378/9 =42

What is the average of all numbers between 8 and 74 which are divisible by 7?

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