Let, X be the percent of fat calories that a person in America consumes each day.
X follows normal distribution with mean = 32 and standard deviation =14
sample size = n = 12
a)
If then
X follows normal distribution with mean = 32 and standard deviation =14
n = 12
So,
b)
z value for = 35 is,
c)
d )
P( < 35 ) = P( z < 0.742 )
Using Excel, =NORMSDIST( Z )
P( z < 0.742 ) = NORMSDIST( 0.742 ) = 0.771
P( < 35 ) = 0.771
e )
First quartile is a number where a 25% of scores fall below that number .
We have to find first quartile for the average percent of fat calories.
Using Excel function, =NORMINV( probability, mean , sd )
Q1 = NORMSINV( 0.25 , 32 , 4.041 ) = 29.274
Problem 1 The percent of ft caloriesthat a person in America consumes each day is normally...
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