If the scores follow normal distribution with a mean of 120, a standard deviation of 10, find probability that randomly selected score is between 126 and 130.
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If the scores follow
find probability that randomly selected score is between 126 and 130.
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- an exam score has a mean of 506 and a standard deviation of 100. What exam score corresponds to a z-score of -1.90?A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1542 and the standard deviation was 313. The test scores of four students selected at random are 1930,1270,2260,and 1440. Find the z-scores that correspond to each value and determine whether any of the values are unusual.The average score of all golfers for a particular course has a mean of 64 and a standard deviation of 5. Suppose 100 golfers played the course today. Find the probability that the average score of the 100 golfers exceeded 65. Round to four decimal places.
- Assume that adults have IQ scores that are normally distributed with a mean of 103.6 and a standard deviation of 23.3. Find the probability that a randomly selected adult has an IQ greater than 150.0. Round the four decimal places.Assume IQ scores for adults are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability that when an adult is randomly selected, they have an IQ scores between 72 and 118. Round your answer to 4 decimal places.Assume that women's weights are normally distributed with a mean given by mean=143 lb and a standard deviation given by 29 lb. If 3 women are randomly selected, find the probability that they have a mean weight below 113 If 85 women are randomly selected, find the probability that they have a mean weight below 113
- assume that blood pressure readings are normally distributed with a mean of 135 and a standard deviation of 4.9. If 34 people are randomly selected, find the probability that their mean blood pressure will be less than 137.A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what percentage of students spend less than 12 hours in class?A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1457 and the standard deviation was 315. The test scores of four students selected at random are 1900, 1200, 2180, and 1350. Find the z-scores that correspond to each value and determine whether any of the values are unusual. The is the z-score for 1900?
- The distances golf balls travel under laboratory testing conditions are normally distributed. The mean is 313 yards. The probability the golf ball travels further than 322 yards is 0.13. Find the probability a randomly selected golf ball travels between 304 yards and 322 yards. Express the answer as a decimal value rounded to the nearest hundredth.Assume that an intelligence test scores are distributed normallt with a mean of 100 and a standard deviation of 15. If you scored 124 on this intelligence test, what is your z-score on this distribution.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.
