Intelligence Quotient (IQ) scores are often reported to be normally distributed with u = 100.0 and o = 15.0. A random sample of 45 people is taken. Step 1 of 2: What is the probability of a random person on the street having an IQ score of less than 99? Round your answer to 4 decimal places, if necessary.

The weights of steers in a herd are distributed normally. The variance is 10,000 and the mean steer weight is 1100⁢lbs. Find the probability that the weight of a randomly selected steer is between 919 and 1180⁢lbs. Round your answer to four decimal places.

Type in your answer below: As in the previous question, female's pulse rates are normally distributed with a mean 74 beats per minute and a standard deviation 12.5 beats per minute. Find the probability that a female has a pulse rate between 60 beats per minute and 70 beats per minute. You can use a calculator or table A-2 in your textbook. Round your answer to three decimal places.

Using the z-value -2.1, what is the probability of finding a value for the sample mean less than 30.99? Round your answer to four decimal places.