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    SillyWilly377's Avatar
    SillyWilly377 Posts: 3, Reputation: 1
    New Member
     
    #1

    Aug 4, 2010, 12:09 PM
    Please help I swear I am statistically challenged...
    Which of the values below is impossible for the descriptive measure in question?
    Answer
    r = 1.25
    mean = -0.2
    s = 3.4
    both (a) and (b)
    both (a) and (c)

    Here are the number of hours that each of a group of students studied for this exam:

    2 4 22 6 1 4 1 5 7 4

    What is the standard deviation of the number of study hours?
    Answer 5.8
    6.1
    37.2
    33.4
    56

    After finding the mean I then found the sum of all numbers divided that by the numbers minus one and got 6.09 which is 6.1 rounded up. Is this correct?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
     
    #2

    Aug 5, 2010, 02:05 AM

    You received feedback on the first part of your question in the other thread you made.

    For the second part, you should know the formula for standard deviation:



    And with that, I get 5.782832918 = 5.8 (2 sf)

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