Homework Help: stats

Posted by Komal on Tuesday, October 23, 2012 at 4:46pm.

For a normal population with ľ = 100 and σ = 20:

1. What is the probability of a particular score being greater than 110?

2. What is the probability of a particular score being less than 50?

stats - MathGuru, Tuesday, October 23, 2012 at 6:12pm
Use z-scores:

z = (x - mean)/sd

Your data:
x = 110, 50
mean = 100
sd = 20

Calculate both z-scores. Use a z-table to determine probability for each score.

I hope this will help get you started.

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