1.

1). 502). 563). 604). 64

Answer»

When WEIGHT of STUDENT is wrongly recorded as 84 INSTEAD of 48 the average of weight of class increased by 0.5 kg.

Let the strength of class be X.

Total increased in weight = 0.5 × X = 0.5X----(1)

This increased in weight statistics is equal to DIFFERENCE between actual and misreported weight of student.

Increase in weight = 84 - 48 = 36 kg----(2)

Equating results (1) & (2) -

0.5X = 36

⇒ X = 72



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