Question

Solve the following problem::
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? !!

Answer 1

★Hey there★

Let's say the sum of her scores in her first 4 exams are:----

73+86+78+75=312

Now she scores x in her fifth exam, so average

=Sum of events/Number of events

=312+x/5

Since Average=80, so

80=312+x/5

312+x=400

Therefore, she must score x=88 marks in her 5th test...

★HOPE IT HELPS★

Answer 2

Let Nisha scores x marks n her 5th test so as to have as mean score of 80 marks in her five test

A/Q

(73+86+78+75+x)/5=80
(312 + x)/5=80
312 + x=400

x= 88

So, Nisha has to score 88 marks in her 5th test so has to have a mean score of 80 marks in five test. Ans