1.

1). 652). 663). 684). 70

Answer»

As PER the given data,

Let the required MEAN SCORE be x,

Then 20/100 × 60 + 30/100 × 40 + 50/100 × x = 58

⇒ 1200 + 1200 + 50X = 5800

⇒ 2400 + 50x = 5800

⇒ 50x = 5800 - 2400 = 3400

⇒ x = 3400/50 = 68



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