The average marks of 7 students is 42%. When a student joined this group, the average increases to 48%. The marks of the student who joined is
Explanation:
Aggregate marks (%) of 7 students = 7 × 42 = 294
With a new member in the group, whose marks is x%,
we have, (294 + x)/8 = 48
⇒ 294 + x = 384.
⇒ x = 90
Hence, option (d).
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