Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

- Index
- » Help Me !
- »
**statistics**

Pages: **1**

**cassrl****Member**- Registered: 2012-10-03
- Posts: 4

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,668

Hi cassrl;

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

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

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

Pages: **1**

- Index
- » Help Me !
- »
**statistics**