Question

nisha scored 73, 86, 78 and, 75 marks in 4 test what is the least number of Masi can score in her next test if she has to have a mean score of 80 marks in 5 test test

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

Answer:

88

Step-by-step explanation:

Mean : The sum of quantities divided by the number of quantities is known as the mean. It is also known as an average.

Also, Mean = Sum of quantities/Number of quantities

Then, first we have to find her current total marks ,i.e, 73 + 86 + 78 + 75

Therefore, her current total marks are 312.

Now, the mean of 5 tests are given to be 80, i.e. , she has to acquire at least a mean of 80 in 5 tests.

Then, her total should be 80*5 = 400.

We already know she has scored 312 marks in 4 tests.

Therefore she must score at least 400 - 312 marks in her 5th test.

Therefore, Nisha must score at least 88 marks in her next test.

Hope it Helps!