The lifespans of zebras in a particular zoo are normally distributed. The average zebra lives 20.520.5 20.5 20, point, 5 years; the standard deviation is 3.93.9 3.9 3, point, 9 years. Use the empirical rule (68−95−99.7%)(68 - 95 - 99.7\%) (68−95−99.7%) left parenthesis, 68, minus, 95, minus, 99, point, 7, percent, right parenthesis to estimate the probability of a zebra living longer than 32.232.2 32.2 32, point, 2 years.

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Find the derivative of the function

Customers are used to evaluate preliminary product designs. in the past, 93% of highly successful products received good reviews, 51% of moderately successful products received good reviews, and 14% of poor products received good reviews. in addition, 40% of products have been highly successful, 35% have been moderately successful and 25% have been poor products. round your answers to four decimal places (e.g. 98.) what is the probability that a product attains a good review? (b) if a new design attains a good review, what is the probability that it will be a highly successful product? (c) if a product does not attain a good review, what is the probability that it will be a highly successful product?