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Average height & variance of 5 students ...

Average height & variance of `5` students in a class is `150` and `18` respectively. A new student whose height is `156 cm` is added to the group. Find new variance. (a) `20` (b) `22` (c) `16` (d) `14`

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The correct Answer is:
20
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Knowledge Check

  • The average height of the students in a class of 10 is 105 cm .If 20 more students with an average height of 120 cm join the class , what will the new average height be ?

    A
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    B
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    C
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    D
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  • The mean height of a group of 30 students is 150 cm. If a 150 cm tall student is included in the group , then the mean height of the new group is ___.

    A
    151 cm
    B
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    C
    150 cm
    D
    152 cm

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