1. The area between z = 0 and z = 0.8 under the standard normal curve is?
(Round to four decimal places)
2. For the standard normal distribution, find the probability of z occuring in the indicated region of -2.06 and 1.16.
The probability is? (Round to four decimal places.)
3. The times per week a student uses a lab computer are normally distributed, with a mean of 6.2 hours and a standard deviation of 0.9 hours. A student is randomly selected. Find the following probabilities.
a) Find the probability that the student uses a lab computer less than 4 hours per week.
b) Find the probability that the student uses a lab computer between 5 and 7 hours per week.
c) Find the probability that the student uses a lab computer more than 8 hours per week.
(Round to three decimal places)