chapter frequency and distribution
Nisha scored 73,86,78 and 75 marks in four tests. What is the least number of marks she can score in her next test,if she has to have a mean score of 80 marks in five tests?
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let least number to be scored be 'a'
now,
(73+86+78+75+a)/5=80
312+a=80*5
312+a=400
a=400-312=88
now,
(73+86+78+75+a)/5=80
312+a=80*5
312+a=400
a=400-312=88
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