A study has shown that 20% of all college textbooks have a price of $184.52 or higher. It is known that the standard deviation of the prices of all college textbooks is $36.35. Suppose the prices of all college textbooks have a normal distribution. What is the mean price of all college textbooks?
Answer to relevant QuestionsA machine at Keats Corporation fills 64-ounce detergent jugs. The machine can be adjusted to pour, on average, any amount of detergent into these jugs. However, the machine does not pour exactly the same amount of detergent ...Find the following binomial probabilities using the normal approximation. a. n = 140, p = .45, P(x = 67) b. n = 100, p = .55, P(52 < x < 60) c. n = 90, p = .42, P(x > 40) d. n = 104, p = .75, P(x < 72) An office supply company conducted a survey before marketing a new paper shredder designed for home use. In the survey, 80% of the people who tried the shredder were satisfied with it. Because of this high satisfaction rate, ...The print on the package of Sylvania CFL 65W replacement bulbs that use only 16W claims that these bulbs have an average life of 8000 hours. Assume that the distribution of lives of all such bulbs is normal with a mean of ...Otto is trying out for the javelin throw to compete in the Olympics. The lengths of his javelin throws are normally distributed with a mean of 253 feet and a standard deviation of 8.4 feet. What is the probability that the ...
Post your question