The mean weight per student in a group of seven students is 55 kg if the individual weights of 6 students are 52, 58, 55, 53, 56 and 54; then weight of the seventh student is

55 kg

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60 kg

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57 kg

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50 kg

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Solution

The correct option is C 57 kg
Total weight of 7 students is $= 55 \times 7 = 385 k g$
Sum of weight of 6 students
$= 52 + 58 + 55 + 53 + 56 + 54 = 328 k g$
$∴$ Weight of seventh student $= 385 - 328 = 57 k g .$

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The mean weight of a group of seven boys is 56 kg. The individual weights (in kg) of six of them are 52, 57, 55, 60, 59 and 55. Find the weight of the seventh boy.

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The mean weight per student in a group of seven students is 55 kg if the individual weights of 6 students are 52, 58, 55, 53, 56 and 54; then weight of the seventh student is

The correct option is C 57 kgTotal weight of 7 students is =55×7=385kg Sum of weight of 6 students =52+58+55+53+56+54=328kg ∴ Weight of seventh student =385–328=57kg.

The correct option is C 57 kg
Total weight of 7 students is $= 55 \times 7 = 385 k g$
Sum of weight of 6 students
$= 52 + 58 + 55 + 53 + 56 + 54 = 328 k g$
$∴$ Weight of seventh student $= 385 - 328 = 57 k g .$