## Question

###### Please help me do this pH measurements of a chemical solutions have mean 7.4 with standard...

please help me do this

pH measurements of a chemical solutions have mean 7.4 with standard deviation 0.01. Assuming all pH measurements of this solution have a nearly symmetric/bel curve distribution. Find the percent (%) of pH measurements reading below 739 OR above 7.4.

## Answers

for normal distribution z score =(X-μ)/σx here mean= μ= 7.4 std deviation =σ= 0.0100 % of measurement below 7.39 or above 7.40 =1-P(7.39<X<7.40)=1-P(-1<Z<0)

=1-(0.5-0.1587)=0.6587 ~

65.87%

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