Question

Nisha secured 73 ,86,78,and 75 marks in four tests. What is the least number of marks she can secure in her next test, if she has to have a mean score of 80 marks in five tests?

Answer 1

Answer: 88 marks

Step-by-step explanation:

Marks in 4 tests = 73,86,78,75

Mean for 5 tests = 80

Total marks in 4 tests = 73+86+78+75 = 312

Mean = Sum/Number

Sum = Mean * Number = 80*5 = 400

Hence in 5 tests her total marks should be 400 so that her mean score is 80.

marks in 5th test = Total mark in 5 tests - total marks in 4 tests

                            = 400 - 312 = 88

5th test score = 88 marks