Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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Topic review (newest first)

bobbym
2012-10-04 00:25:31

Hi cassrl;

I am getting for A) .608421 as the probability.

For B) you use the central Limit Theorem. Please try that now.

cassrl
2012-10-03 23:38:57

X score is normally distibuted with mean 90 and standard deviation 23 Find:
A-the probability of a score between 76 and 117
b-probability that the mean score of a sample of n=64 is greater than 97

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