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In the first four papers each of 100 marks, Rishigot `95 ,72 ,73 ,83`marks. If he wants an average of greater than or equalto `75`marks and less than `80`marks, find the range of marks he should score in thefifth paper. |
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Answer» 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)`. |
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