Some numbers are not normally distributed. If the mean of the numbers is 38 and the...
The lengths of pregnancies in a small rural village are normally distributed with a mean of 264 days and a standard deviation of 12 days. In what range would you expect to find the middle 50% of most pregnancies? Between and . If you were to draw samples of size 38 from this population, in what range would you expect to find the middle 50% of most averages for the lengths of pregnancies in the sample? Between and . Enter...
Scores on a test are normally distributed with a mean of 70 and standard deviation of 10. Applying the Empirical Rule, we would expect the middle 95% of scores to fall between what two values? 40 and 100 50 and 90 55 and 85 60 and 80 65 and 75
Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 57 hours and a standard deviation of 3.5 hours. With this information answer the following questions. (a) What proportion of light bulbs will last more than 62 hours? (b) What proportion of light bulbs will last 50 hours or less? (c) What proportion of light bulbs will last between 58 and 62 hours? (d) What is the probability that a randomly selected light bulb lasts...
please answer all parts. The drive distance (in yards) for professional golfers is normally distributed with a mean of 287.47 yards and a standard deviation of 12.887 yards. a. Between what two values would we expect 95% of Bubba Watson's drive distances to fall? o betweern and yards b. What percentage of golfers has a drive distance between 280 and 305 yards? percentage- % (make sure to change your decimal to a percentage) o C. The top 14% of golfers...
The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean =μ39 and standard deviation =σ5. (a) What is the probability that a randomly chosen tire has a lifetime greater than 47 thousand miles? (b) What proportion of tires have lifetimes between 38 and 43 thousand miles? (c) What proportion of tires have lifetimes less than 44 thousand miles? Round the answers to at least four decimal places.
The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days and a standard deviation of 14 days. In what range would you expect to find the middle 95% of most pregnancies? Between 233 xan x and 284 x! If you were to draw samples of size 40 from this population, in what range would you expect to find the middle 95% of most averages for the lengths of pregnancies in the sample?...
suppose that the scores on a reading a Bility test are normally distributed with a mean of 60 and a standard deviation of nine. What proportion of individuals scored at least 75 points on this test? Round your answer to at least four decimal places
Suppose that the scores on a reading ability test are normally distributed with a mean of 65 and a standard deviation of 10 . What proportion of individuals score at least 55 points on this test? Round your answer to at least four decimal places.
A population is normally distributed with a mean of 55 and a standard deviation of 4. Using the Empirical Rule, approximately what percentage of data values fall between 51 and 59? Please show your calculations.
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 79 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least four decimal places. (a) What proportion of the scores were above 93? (b) What proportion of the scores were below 66? (c) What is the probability that a randomly chosen score is between 70 and 90?