Mean

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  • Q1

    Consider the data given below:

    Find the arithmetic mean of the marks given above.

    Marks:3
    Answer:

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  • Q2

    The mean of 10 observations is 25. If one observation, namely 25, is deleted, find the new mean.

    Marks:3
    Answer:

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  • Q3

    Two dice are rolled simultaneously 11 times. The sums of the numbers on the dice after each roll are 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12. Find the mean of this data.

    Marks:2
    Answer:

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  • Q4

    The mean of 20 numbers is 15. If 2 is added to each of the first ten numbers, find the mean of the new set of 20 numbers.

    Marks:2
    Answer:

    Sum of 20 numbers = 20 × 15 = 300
    Sum of new set of 20 numbers = 300 +10 × 2 = 320
    mean =

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  • Q5

    The mean weight of a class of 34 students is 46.5 kg. If the weight of the teacher is included, the mean is increased by 500 g. Then,find the weight of the teacher.

    Marks:2
    Answer:

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