SOLUTION: a.Estimate a value of Z that the area under the standard normal curve to the
right of z is 0.25.
b find the area under the standard normal curve between z1= -2.50 and z2 = -1
Algebra.Com
Question 894846: a.Estimate a value of Z that the area under the standard normal curve to the
right of z is 0.25.
b find the area under the standard normal curve between z1= -2.50 and z2 = -1.25
c. estimate the value of z such that the area under the standard normal curve
between -z and z is 0.70.
d. for the standard normal curve find the value of z such that the area to
the left of -z plus the area to the right of z is 0.05.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a.Estimate a value of Z that the area under the standard normal curve to the
right of z is 0.25.
P(z > 0.25) = normalcdf(0.25,100) = 0.4013
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b find the area under the standard normal curve between z1= -2.50 and z2 = -1.25
P(-2.5 < z < -1.25) = normalcdf(-2.5,-1.25) = 0.0994
---------------------------------
c. estimate the value of z such that the area under the standard normal curve
between -z and z is 0.70.
Note: 0.35 must be on the left side of the mean.
That leaves a left tail of 0.15
invNorm(0.15) = -1.036
Answer:: z = 1.036
-----------------------------
d. for the standard normal curve find the value of z such that the area to
the left of -z plus the area to the right of z is 0.05.
Ans: invNorm(0.05) = -1.645
=====================
Cheers,
Stan H.
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