1 Based on the standard normal distribution curve with mean

1. Based on the standard normal distribution curve (with mean of 0 and a standard deviation of 1), if a is a positive number and P(Z>a)=0.15, find the value of P(-a<Z<a):

A) 0.15 B) 0.30 C) 0.70 D) 0.85

2. The amount of syrup that people put on their pancakes is normally distributed with mean 60mL and a standard deviation 10 mL. Find the probability that a randomly selected customer puts between 55mL and 65mL of syrup on his/her pancakes.

3. the time customers at a restaurant spent reading the menu follows uniform distribution between 2 and 10 minutes. find the 80th percentile for the time customers spent reading the menu.

Solution