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Standard XII

Mathematics

Mean

The mean weig...

Question

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 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 $= 385 - 328 = 57 k g .$