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A survey was conducted by a group of stu...

A survey was conducted by a group of students as a part of their environment awareness programme , in which they collected the follwing data regarding the number of plants in 20 houses in a locality . Find the mean number of plants per house .
`{:("Number of plants","Number of houses"),(0-2,1),(2-4,2),(4-6,1),(6-8,5),(8-10,6),(10-12,2),(12-14,3):}`

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The correct Answer is:
8.1.
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A survey was conducted by a group of students as a part of their environmental awareness programme, in which they collected the following data regarding the number of plants In 20 houses in a locality. Find the mean number of plants per house.

A survey conducted on 20 households in a locality by a group of students resulted in the following frequency table for the number of famialy members in a household . {:("Family size ","Number of families"),(1-3,7),(3-5,8),(5-7,2),(7-9,2),(9-11,1):} Find the mode of this date.

Knowledge Check

  • The rank of the matrix |{:(3,5,-1,4),(2,1,3,-2),(8,11,1,6),(-7,14,6,-14):}| is

    A
    1
    B
    2
    C
    3
    D
    4

  • The number of students absent in a class were recorded every day for 120 days and the information is given in the following frequency table. Then mean number of students absent per day is {:("No. of student absent",0,1,2,3,4,5,6,7),("No. of days ",1,4,10,50,34,15,4,2):}

    A
    `3 . 325`
    B
    `3 . 425`
    C
    `3. 525`
    D
    `4 . 525`

  • The approximate value of the mean deviation about the mean for the following data is {:("Class interval", 0-2,2-4,4-6,6-8,8-10),("Frequency" ," "1," "2," "3," "2," "1):}

    A
    3.56
    B
    4.61
    C
    2.19
    D
    1.78

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