Question

The mean age of 5 students whose ages are 8,x,13,12,and 10 is 10. calculate the value of x in years​

Answer 1

x = 7 years

Explanation:

The mean (M) is defined as the average of the sum of all the data points in a set:

`M=(r_(1)...r_(n) )/(n)`

Thus, since there are five data points and we're given the mean, we can use the following formula to find x:

`M=10\\10=((8+x+13+12+10))/(5)\\ 50=43+x\\7=x`