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Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted. The students kept track of many lifestyle variables including how many hours of sleep obtained on a typical day. Researchers found that visually impaired students averaged 8.28.2 hours of sleep, with a standard deviation of 2.22.2 hours. Assume that the number of hours of sleep for these visually impaired students is
(a) What is the probability that a visually impaired student gets less than 6.56.5 hours of sleep?
answer:
(b) What is the probability that a visually impaired student gets between 6.96.9 and 10.6810.68 hours of sleep?
answer:
(c) Twenty percent of students get less than how many hours of sleep on a typical day?
answer: hours
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- The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an average (mean) of 1.8 pounds with a standard deviation of 0.95 pounds. In a recent study, a group of 55 people who used this pill were interviewed. The study revealed that these people lost a mean of 1.9 pounds after one week. If the producer's claim is correct, what is the probability that the mean weight loss after one week on this pill for a random sample of 55 individuals will be 1.9 pounds or less? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.arrow_forwardIt is flu season again. On average 549 UCI students get sick, with a standard deviation of 30 students. If there are 600 or more students who get sick, there is an epidemic. What is the probability there will be an epidemic?arrow_forwardThe daily sales of a small retail store in tokyo for the last 365 days are normally distributed with a mean of $2050, and a standard deviation of $300. From a sample of 49 days, what is the probability of having a sample mean less than $2000?arrow_forward
- The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an average (mean) of 1.8 pounds with a standard deviation of 1.05 pounds. In a recent study, a group of 45 people who used this pill were interviewed. The study revealed that these people lost a mean of 1.73 pounds after one week. If the producer's claim is correct, what is the probability that the mean weight loss after one week on this pill for a random sample of 45 individuals will be 1.73 pounds or more? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.arrow_forwardThe producer of a weight-loss pill advertises that people who use the pill lose, after one week, an average (mean) of 1.75 pounds with a standard deviation of 1.02 pounds. In a recent study, a group of 60 people who used this pill were interviewed. The study revealed that these people lost a mean of 1.9 pounds after one week. If the producer's claim is correct, what is the probability that the mean weight loss after one week on this pill for a random sample of 60 individuals will be 1.9 pounds or less? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.arrow_forwardIf charge rates for annual tutoring services has a standard deviation of $1000, what is the probability that the mean charge rate of 300 randomly selected tutoring services will be within $80 of the mean charge rate of all tutoring servicesarrow_forward
- The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an average (mean) of 1.8 pounds with a standard deviation of 0.95 pounds. In a recent study, a group of 45 people who used this pill were interviewed. The study revealed that these people lost a mean of 1.92 pounds after one week. If the producer's claim is correct, what is the probability that the mean weight loss after one week on this pill for a random sample of 45 individuals will be 1.92 pounds or less? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.arrow_forwardA sample of n = 64 scores has a mean of M = 45 and an estimated standard error of 3 points. What is the sample variance? Select one: a. s2 = 113 b. s2 = 576 c. s2 = 498 d. s2 = 502arrow_forward
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