Normal Probability Z Table

A factory produces light bulbs with a mean lifespan of 1200 hours and a standard deviation of 100 hours. What is the probability that a randomly selected light bulb will last more than 1250 hours? Use the standard normal table to find the probability.

A standardized test has a mean score of 500 and a standard deviation of 80. What is the probability that a randomly selected student scores between 480 and 520?

The average height of adult males in a certain country is 175 cm with a standard deviation of 10 cm. What is the probability that a randomly selected adult male is shorter than 160 cm?

The average weight of a newborn baby is 3.5 kg with a standard deviation of 0.5 kg. What is the probability that a randomly selected newborn weighs between 3 kg and 4 kg?

What is the probability that a score is under (left of) -.37?

What percent of scores are below a z-score of $$z=-1.02$$ ?  (Use either the attached image of a z-table or use your own copy of the z-table from your notes)

In a normal distribution find the probability Z > 1.3

What percent of scores are at or below a z-score of $$z=1.42$$ ? (You can use the z-table from last class's work!)

What is the probability that a score is under (left of) 1.73?

What is the probability that a score is under (left of) .73?