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  • 13-05-2021
  • Mathematics
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Please help me answer this question

Please help me answer this question class=

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sqdancefan
sqdancefan sqdancefan
  • 13-05-2021

9514 1404 393

Answer:

  B.  3.5

Step-by-step explanation:

The given range is 20 ± 7. The empirical rule tells you 95% of scores will fall within μ ± 2σ. We know μ = 20, so 2σ = 7. That is σ = 7/2 = 3.5.

The standard deviation is 3.5.

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