Mean and Median

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  • Q1

    On how many days, the rainfall was less than the mean rainfall.

    Day Mon

    Tue

    Wed

    Thurs

    Fri

    Sat

    Sun

    Rainfall (in mm)

    0.3

    11.4

    7.1

    2.9

    4.5

    9.1

    11.2

    Marks:1
    Answer:

    3

    Explanation:

    Mean rainfall = (0.3 + 11.4 + 7.1 + 2.9 + 4.5 + 9.1 + 11.2)/ 7
    = 46.5/ 7
    = 6.6 (approx.)
    Monday = 0.3 mm, Thursday = 2.9 mm, Friday = 4.5

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  • Q2

    The mean of the first 9 whole numbers is,

    Marks:1
    Answer:

    4.

    Explanation:
    The mean of first 9 whole numbers = (0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8)/9 = 36/9 = 4.
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  • Q3

    The median of the first ten whole numbers is

    Marks:1
    Answer:

    5.

    Explanation:
    First ten whole numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10.
    Median is the middle observation of the given data.
    Here, the middle observation = 5.
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  • Q4

    The median of 9, 6, 14, 15 and 11 is

    Marks:1
    Answer:

    11

    Explanation:

     

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  • Q5

    The median of the numbers 2, 2, 2, 3, 3, 4, 5, 5, 5, 6, 6, 8, 9, 7, 7 is

    Marks:1
    Answer:

    5

    Explanation:

    Arrange the data in ascending order - 2, 2, 2, 3, 3, 4, 5, 5, 5, 6, 6, 7, 7, 8, 9
    Here n = 15 (odd)
    Median = {(n + 1)/2}th term
    = {(15 + 1) /2} th term
    = 8th term
    = 5
    The median is the middle term of data .
    Therefore, the median is 5.

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