Find z so that 90% of the standard normal curve is between -z and z.  Choose the closest answer.

Z is distributed as a standard normal variable. Use Excel to find Pr(Z > -2.43).

Find z such that 58% of the standard normal curve lies between −z and z. (Round your answer to two decimal places.)

First, look up the equation for the normal curve. Now, using this equation, calculate the area under the curve for a z score between 0 and 1.

Find z such that 72% of the standard normal curve lies between −z and z. (Round your answer to two decimal places.)

Find -z and z such that 55% of the standard normal curve lies between –z and z.

Find z such that 4.6% of the standard normal curve lies to the right of z.

Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random sample of 50 male firefighters are tested and that they have a plasma volume sample mean of x = 37.5 ml/kg (milliliters plasma per kilogram body weight). Assume that ? = 7.20 ml/kg for the distribution of blood plasma.

find z so that 95% of a standard normal curve lies to the right of z

Find z such that 30% of the standard normal curve lies to the left of z. Choose the closest answer.