If z is a standard normal variable, find the probability that z is less than − 2.08 ( round the answer in four decimal places)

A bone mineral density test is used to identify a bone disease. The result of a bone density test is commonly measured as a z-score. If the mean bone density test score is found for 9 randomly selected subjects, find the probability that the mean is greater than 0.50. (Round your answer to four decimal points and write in 0.XXXX format.)

a normal distribution has a mean of u=60 with o=15.  if one score is randomly selected from the distribution, what is the probability that the score will be greater than x=35

Let X and Y be two independent random variables from exponential distribution with mean 3 and 4, respectively. Find P (6Y > X) Note: Please round your answer to 4 decimal places.

Assume the random variable X is normally distributed with mean =50 and standard deviation =7. Compute the probability.  P(X > 36)=

The probability that an event will not happen is PE′=0.79. Find the probability that the event will happen.

The time it takes me to ride my bike to school is uniformly distributed between 27 minutes and 36 minutes What is the probability that I can ride my bike to school in under 35 minutes? Give your answer accurate to two decimal places.