Question

the mean marks of seven students are 55. The marks of six students are 52 54 55 53 56 and 54. Find the marks of the seventh student​

Answer 1

Answer:

First add the marks of five students then subtract it from mean marks

Answer 2

Mean marks of 7 students=55

Marks of 6 students=52,54,55,53,56,54

Let the marks of seventh student be x

Then,

55=52+54+55+53+56+54+x

7

55x7=52+54+55+53+56+54+x

385=324+x

385-324=x

61=x

Hence,Marks of seventh student is 61