Question 8 (1 point) Suppose that the mean and standard deviation of the scores on a...
Problem 8. (1 point) Suppose the scores of students on a Statistics course are Normally distributed with a mean of 261 and a standard deviation of 66 What percentage of the students scored between 261 and 391 on the exam? (Give your answer to 3 significant figures) I percent.
Scores on exam-1 for a statistics course are normally distributed with mean 65 and standard deviation 1.75. What scores separates highest 15% of the observations of the distribution ?
PL;EASE HELP!! THANK YOOUUUU! (1 point) Suppose the scores of students on a Statistics course are Normally distributed with a mean of 574 and standard deviation of 40. What percentage of the students scored between 574 and 654 on the exam? percent (1 point) Suppose that X is normally distributed with mean 120 and standard deviation 29. A. What is the probability that X is greater than 163.21? Probability = B. What value of X does only the top 18%...
Suppose that scores on a statistics exam are normally distributed with a mean of 77 and a standard deviation of 4. Find the probability of a student scoring less than 80 on the exam using the following steps. (a) What region of the normal distribution are you looking to find the area of? (to the left of a zscore, to the right of a z-score, between two z-scores, or to the left of one z-score and to the right of...
(1 point) A)Suppose the scores of students on an exam are Normally distributed with a mean of 303 and a standard deviation of 89. Then approximately 99.7% of the exam scores lie between the numbers _____and_____ such that the mean is halfway between these two integers. (You are not to use R for this question.) B) A telemarketer calls people and tries to sell them a subscription to a daily newspaper. On 16% of her calls, there is no answer...
8. Suppose the scores of students on an exam are normally distributed with mean u = 17.6 and standard deviation o = 4.9. (a) Determine the distribution of the sample mean score for a randomly selected sample of 36 students who took the exam. (b) Find the probability that the sample mean score will be less than 20 for a sample of 36 randomly selected students. (c) How large a sample size would be required to ensure that the probability...
Suppose the scores on a statistic exam are normally distributed with a mean of 77 and a variance of 25. What is the 25th percentile of the scores? What is the percentile of someone who got a score of 62? What proportion of the scores are between 80 and 90? Suppose you select 35 tests at random, what is the proportion of scores above 85?
(1 point) Scores on a standardized exam are normally distributed with a mean of 539 and a standard deviation of 99. The figure below shows the distribution of the scores on a standardized exam. Calculate the shaded area under the curve. Express your answer in decimal form with at least two decimal place accuracy Answer 472.67 137 The Scores on a Standardized Exan
if statistics test scores were normally distributed with a mean of 81 and a standard deviation of 4, a) what is the probability that a randomly selected student scored less than 70? b) what percentage of students had a B on the exam? c) the top 10% of the class had what grades?
scores for an exam are normally distributed with a mean of 235 and a standard deviation of 52. Identify the score which marks the boundary of the bottom 5% ?