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    cspearson's Avatar
    cspearson Posts: 1, Reputation: 1
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    #1

    Jul 15, 2007, 04:32 PM
    Standard Deviation
    On one of my homework assignments I had this question:

    A coin is tossed 72 times. Find the standard deviation for the number of heads that will be tossed.

    Could you please help me get started? Then I will be fine.

    Thank you,
    Cheryl
    :confused:
    makdan's Avatar
    makdan Posts: 46, Reputation: 3
    Junior Member
    		  
    #2

    Jul 15, 2007, 05:42 PM
    Quote Originally Posted by cspearson
    on one of my homework assignments I had this question:

    A coin is tossed 72 times. Find the standard deviation for the number of heads that will be tossed.

    Could you please help me get started? Then I will be fine.

    Thank you,
    Cheryl
    :confused:
    Does your textbook specify a formula for the standard deviation of a binomial distribution?

    If not, it's been a very long time since I took probability and statistics, but I believe the standard deviation is np(1-p), where n is the number of trials and p is the probability of success.
    s_cianci's Avatar
    s_cianci Posts: 5,472, Reputation: 760
    Uber Member
    		  
    #3

    Jul 15, 2007, 07:39 PM
    This is a binomial event. The standard deviation is sqrt(npq), where n = # of tosses, p = probability of getting a head on any one toss and q = probability of getting a tail on any one toss.
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