Assume that a normal distribution of the data has a mean of 25 and a standard deviation of 5. Find the probability of P(x > 25) Round your answer to 4 decimals.
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Assume that a
Find the probability of P(x > 25)
Round your answer to 4 decimals.
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- Scores on the SAT test have a mean of 1518 and a standard deviation of 325. If 100 students are randomly chosen and the mean of their SAT scores is calculated, find the probability that the sample mean is less than 1460.The scores on a test are normally distributed with a mean of 150 and a standard deviation of 30. Find the score that is 2 1/2 standard deviations above the mean.Assume that adults have IQ scores that are normally distributed with a mean of 99.9 and a standard deviation of 24.5. find the probability that a randomly selected adult has an IQ greater than 134.1. (round to four decimal places as needed)
- A normal distribution has a mean of 148 and a standard deviation of 5. Find the z-score for a data value of 136.Females have pulse rates that are normally distributed with a mean of 74 beats per minute and a standard deviation of 12.5 beats per minute. If 16 adult female are randomly selected, find the probability that their pulse rates are less than 70 beats per minute. Express your answer as a percent rounded to 2 decimal places.The scores on a test are normally distributed with a mean of 200 and a standard deviation of 30. Find the score that is 2 1/2 standard deviations above the mean.
- A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If an applicant is randomly selected, find the probability that the applicant's rating will be between 205 and 275. (Round your answer to 4 decimal places.)The life of light bulbs is distributed normally. The standard deviation of the lifetime is 25 hours and the mean lifetime of a bulb is 510 hours. Find the probability of a bulb lasting for at most 552 hours. Round your answer to four decimal places.Assume that the mean height of men in the United States is 70 inches, with a standard deviation of 3 inches. A particular man is 80 inches tall. Find the z-score of his height. (Round to two decimal places.)
- The mean of the test is 89 with a standard deviation of only 4. How likely (what probability) is there that a student scored a perfect score of 100 or better?Assume that blood pressure readings are normally distributed with a mean of 116 and a standard deviation of 8. If 100 people are randomly selected, find the probability that their mean blood pressure will be less than 118. Round to four decimal places.A distribution of values is normal with a mean of 246.2 and a standard deviation of 99.5. Find P78, which is the score separating the bottom 78% from the top 22%. P78 Enter your answer as a number accurate to 4 decimal places.
