A random sample of 530 households resulted in the following frequency distribution for a number of cars per household. Find the mean and standard deviation.(adsbygoogle = window.adsbygoogle || []).push({});

Number of cars ¦ Frequency

1 ¦ 61

2 ¦ 108

3 ¦ 179

4 ¦ 118

5 ¦ 64

Sorry don't know how to put this in a box. Under cars it's 1,2,3,4,5. Under frequency it'a 61,108,179,118,64. I typed the Freq. into my calculator and my mean was 106 and my standard deviation was 48.13.

I was marked off 6 points. Shoud I have just done cars? Put that into my calculator and my mean would be 3 and my sd be 1.6?

Thanks

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# What did I do wrong?

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