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?
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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
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