Arnold F. answered • 03/22/16

College Professor & Expert Tutor In Statistics and Calculus

Arnold F.

03/23/16

Davina D.

03/23/16

Arnold F.

03/23/16

Davina D.

asked • 03/22/16after adding all of the numbers i get 954 in which i then divide by the total of numbers which is 24 leaving me with

954/24 = 39.75 for the mean.

With this one its a little more complicated.

DATA / MEAN / ANSWER / SQUARED

57 - 39.75 = 17.25 = 297.5625

27 - 39.75 = -12.75 = -162.5625

32 - 39.75 = -7.75 = -60.0625

31 - 39.75 = -8.75 = -76.5625

34 - 39.75 = -5.75 = -33.0625

38 - 39.75 = -1.75 = -3.0625

71 - 39.75 = 31.25 = 976.5625

33 - 39.75 = -6.75 = -45.5625

34 - 39.75 = -5.75 = -33.0625

53 - 39.75 = 23.25 = 540.5625

36 - 39.75 = -3.75 = -14.0625

42 - 39.75 = 2.25 = 5.0625

26 - 39.75 = -13.75 = -189.0625

52 - 39.75 = 12.25 = 150.0625

36 - 39.75 = -3.75 = -14.0625

55 - 39.75 = 21.25 = 451.5625

36 - 39.75 = -3.75 = -14.0625

42 - 39.75 = 2.25 = 5.0625

36 - 39.75 = -3.75 = -14.0625

54 - 39.75 = 14.25 = 203.0625

34 - 39.75 = -5.75 = -33.0625

29 - 39.75 = -10.75 = -115.5625

33 - 39.75 = -6.75 = -45.5625

33 - 39.75 = -6.75 = -45.5625

squared total = 1730.5 (variance)

standard deviation

σ=√1730.5

=41.599279

=42

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Arnold F. answered • 03/22/16

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College Professor & Expert Tutor In Statistics and Calculus

Arnold F.

Negative times a negative is a positive.

Change your negatives to positives; re add to get sum of squares; divide by n; take the square root; that should be the standard deviation.

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03/23/16

Davina D.

oh okay i see what i did wrong. okay that makes sense.

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03/23/16

Arnold F.

Glad I could help.

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03/23/16

you added right but on your Data/Mean/ Answered / Squared table you left off the second number.

It should be 57,27,32

not 57,32,31

Davina D.

so is my answer correct or incorrect because i have two different answers and i am not sure if i am doing this right. some of my answers are negative and i cant change that and the next step is to square them but if it cant be negative then what am i doing wrong?

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03/23/16

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Davina D.

03/23/16