Question: 7.12) Find z if a) the normal- curve area between 0 and z is 0.3340; b) the normal- curve area to the right of z

7.12) Find z if

a) the normal- curve area between 0 and z is 0.3340;

b) the normal- curve area to the right of z is 0.8665;

c) the normal- curve area to the right of z is 0.0228;

d) the normal- curve area between -z and z is 0.9500;

7.20) A random variable has a normal distribution with the standard deviation = 10. Find its mean if the probability is 0.8264 that it will take on a value less than 77.5.

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