Posted by Marc on Monday, July 23, 2012 at 7:51pm.
The annual precipitation for one city is normally distributed with a mean of 72 inches and a standard deviation of 3.5 inches. In 95% of the years, the precipitation in this city is between___ and ___

Statistics  MathMate, Monday, July 23, 2012 at 8:57pm
From a normal distribution table, 97.5% probability corresponds to +1.96σ.
Thus μ±1.96σ corresponds to 95% of all years.
1.96σ = 1.96*3.5=6.86"
Therefore 95% of the years have precipitation between 72±6.86"

Statistics  pat, Sunday, January 27, 2013 at 8:57am
n125, n236, s1 power 2=50, s2 2 power=72, m1=100. m2=105

Statistics  rose, Thursday, December 12, 2013 at 11:35pm
n125, n236, s1 power 2=50, s2 2 power=72, m1=100. m2=105
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