Students in a class were asked to report the number of pets of their family

# petsfrequency

1 3

2 19

3 16

4 9

47

I figured the frequencies from the data provided but how do you calculate the sample mean and sample standard deviation?

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- Apr 10th 2009, 08:43 PMlaserpet statistics
Students in a class were asked to report the number of pets of their family

__# pets____frequency__

1 3

2 19

3 16

__4 9__

47

I figured the frequencies from the data provided but how do you calculate the sample mean and sample standard deviation? - Apr 10th 2009, 11:40 PMmr fantastic
To calculate sample mean from a frequency table, read The Sample Mean

To calculate sample variance from a frequency table read Learning Resources: Statistics: Power from Data! Variance and standard deviation (go down about half way). - Apr 11th 2009, 12:07 PMlaser
Thank you for the information. If I interpreted it correctly, I believe the mean is 125/47.

1*3+2*19+3*16+4*19=125

mean=125/47

I don't think I got the standard deviation right

1624/2209=0.73517

SD= 0.85740

Is this correct?