ces.What would the standard deviation need to be so that the probability a drum meets the guarantee is 0.99? Give your answer to three decimal places.

Step by step solution would be super helpful!!! Also, any tricks in the calculator would also be helpful! I got .6296 and .578, and I thought that was right, but they were counted wrong. :(What is the probability that a drum meets the guarantee? Give your answer to four decimal places.What would the standard deviation need to be so that the probability a drum meets the guarantee is 0.99? Give your answer to three decimal places.