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OLga [1]
4 years ago
4

Yuri computes the mean and standard deviation for the sample data set 12, 14, 9, and 21. He finds the mean is 14. His steps for

finding the standard deviation are below. s = StartRoot StartFraction (12 minus 14) squared + (14 minus 14) squared + (9 minus 14) squared + (21 minus 14) squared Over 4 EndFraction EndRoot. = StartRoot StartFraction negative 2 squared + 0 squared + negative 5 squared + 7 squared Over 4 EndFraction EndRoot. = StartRoot StartFraction 4 + 0 + 25 + 49 Over 4 EndFraction EndRoot. = StartRoot StartFraction 78 Over 4 EndFraction EndRoot. = StartRoot 19.5 EndRoot. What is the first error he made in computing the standard deviation?
Mathematics
2 answers:
-BARSIC- [3]4 years ago
7 0

Answer:

Yuri did not subtract 9 - 14 correctly.

I think that is you answer!

jonny [76]4 years ago
5 0

Answer:

Aw snap! We really want to help you out, but it looks like your question is incomplete. Please repost and include all helpful information, so other users can get back to you with the best answer. Thanks! ߷

Step-by-step explanation:

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