Question

marks of 10 students were are follows 25,20,26,12,20,22,15,30,25,and x .If the mean os 21 ,what the vallue of x will be​

Answer 1

Answer:

Mean = sum of all observation / no. of observation

21 = 25+20+26+12+20+22+15+30+25 / 10

21 = 195 + x / 10

21 multiply 10 = 195 + x

210 = 195 + x

x = ( 210 - 195 )

x = 15

Hope it help you !!!

Step-by-step explanation: