nisha secured 73,86,78 and 75marks 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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as she secured 312 marks . in four test .
when average is 80 so (312+X)/5
312+X=400 X=88
when average is 80 so (312+X)/5
312+X=400 X=88
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