Question

if 7 is the mean of 5, 3, 0.5, 4.5, a, 8.5, 9.5 then the value of 'a' is ​

Answer 1

Answer:

Hi.... Here's the answer.....

Mean = sum of the numbers /total no given

7=5+3+0.5+4.5+a+8.5+9.5/7

7*7=31 +a

49=31+a

49-31=a

18=a.

Answer 2

The answer is 18.

Explanation:

The mean of a series of numbers is given as the ratio of the sum of all the numbers in the series to the total number of numbers in the series.

Going by this logic, in the given problem, the mean is calculated as

(5 + 3 + 0.5 + 4.5 + a + 8.5 + 9.5)/7

It is given that the mean of the given series of numbers is 7.

Hence,

(5 + 3 + 0.5 + 4.5 + a + 8.5 + 9.5)/7 = 7

=> (31 + a)/7 = 7

=> a + 31 = 49

=> a = 49 – 31

=> a = 18