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To receive Grade 'A' in a course, one mu...

To receive Grade 'A' in a course, one must obtain an average of 90 marks or more in five examination (each of 100 marks ). If Sunita's marks in first four examination are 87, 92, 94 and 95, find minimum marks that Sunita must abtain in fifth examination to get grade 'A' in the cours.

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Let Sunita requries minimum x marks in fifth exams to abtain 'A' grade. Then average of marks obtained
=`(87 + 92 + 94 + 95 + x )/(5) ge 90`
`rArr (386 +x)/(x) ge 90`
`rArr 386 + x ge 450 `
`rArr x ge 82`
` :.` Minimun marks = 82
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