In the first four papers each of 100 marks, Rishi got `95 ,72 ,73 ,83` marks. If he wants an average of greater than or equal to `75` marks and less than `80` marks, find the range of marks he should score in the fifth paper.

Explanation

Let marks in `5^(th)` paper be x

Average=`(95+72+73+53+x)/5`

`=(323+x)/5`

`75<=(323+x)/5<80`

`375<=323+x<400`

`52<=x<77`

`[52,77)`.