Question

The mean average of 4 numbers is 88 what is the fourth number if three of the numbers are 80 95 and 85?

Answer 1

Answer:the fourth number is =97

Explanation:

Mean = total number of the given numbers( x1 +x2+ x3....) / numbers given

Let the fourth number be x

given that the mean of 4 numbers = 88 and only 3 numbers are given

such that

Mean = total number of the given numbers( x1 +x2+ x3....) / numbers given becomes

88= (80 +90 + 85 + x ) / 4

88 x 4 =80 +90 + 85 + x

352=255+x

x= 352-255

x=97