Suppose that the midterm score of a class is normally distributed with the mean of 68.2...
Suppose that the midterm score of a class is normally distributed with the mean of 68.2 points and the standard deviation of 11.3 points. Answer each question.
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Sketch the curve of the distribution representing the midterm score. Make sure to mark the mean and three standard deviations to either side of the mean.
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Find the probability that a randomly selected student has score at most 65.9
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To be in the top 20% of the class, you need to score what point?
d. What is the probability that the average score of 13 students is more than 87 points?
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Suppose that the midterm score of a class is normally
distributed with the mean of 68.2...
A professor of statistics noticed that the marks in his course are normally distributed. He also...
A professor of statistics noticed that the marks in his course are normally distributed. He also noticed that his morning classes average 75% with a standard deviation of 13% on their final exams. His afternoon classes average 76% with a standard deviation of 12%. A. What is the probability that a randomly selected student in the morning class has a higher final exam mark than a randomly selected student from an afternoon class? Probability = .4761 B. What is the...
suppose the test scores of a history class with 120 students are normally distributed with a...
suppose the test scores of a history class with 120 students are normally distributed with a mean of 78 and a standard deviation of 6 what is the probalitiy that a random student got below a 70? show work clearly b) what is the probability that if 9 kids are selected randomly their mean score is below a 70? c) is your answer to part b based on pop distribution, the distribution of a sample, or a sanple distribution?? explain...
the weights of turkeys on a farm are normally distributed with a mean of 68.2 inches...
the weights of turkeys on a farm are normally distributed with a mean of 68.2 inches and a standard deviation of of 3.9 pounds. What is the probability that a turkey selected at random will weigh less than 16 pounds.
5. Assume the readings on thermometers are normally distributed with a mean of 0°C and a...
5. Assume the readings on thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. Find the probability that a randomly selected thermometer reads between −2.26 and −1.53 and draw a sketch of the region. 6. Assume that a randomly selected subject is given a bone density test. Those test scores are normally distributed with a mean of 0 and a standard deviation of 1. Draw a graph and find the probability of a bone...
if statistics test scores were normally distributed with a mean of 81 and a standard deviation...
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?
Stanford–Binet IQ Test scores are normally distributed with a mean score of 100 and a standard...
Stanford–Binet IQ Test scores are normally distributed with a mean score of 100 and a standard deviation of 15. (10 points) Sketch the distribution of Stanford–Binet IQ test scores. Write the equation that gives the z score corresponding to a Stanford–Binet IQ test score. Sketch the distribution of such z scores. Find the probability that a randomly selected person has an IQ test score Over 145. Under 91.
1. The grade of a Math Quiz is normally distributed with its mean, 81 and standard...
1. The grade of a Math Quiz is normally distributed with its mean, 81 and standard deviation, 8.4. If a student is randomly selected in class, what is the probability that his or her score will be higher than 90?
4. A top brand of a popular pickup truck's life is normally distributed with its mean,...
4. A top brand of a popular pickup truck's life is normally distributed with its mean, 12 years and standard deviation, 4 years. Suppose that the top executives of the automaker decided that only 1.2% of new trucks sold could be replaced with a new truck or fully refunded within the warranty period. What should be a desirable warranty period? 5. The grade distribution of a basic English course in a high school (total 3500 students) is normally distributed with...
The final exam scores in a business class were normally distributed with a mean of 80.5%...
The final exam scores in a business class were normally distributed with a mean of 80.5% and a standard deviation of 4. Find the probability that a randomly selected student scored less than 73.9%.
1. The grade of a Math Quiz is normally distributed with its mean, 81 and standard...
1. The grade of a Math Quiz is normally distributed with its mean, 81 and standard deviation, 8.4. If a student is randomly selected in class, what is the probability that his or her score will be higher than 90? 2. The historical data of a company's annual sales is normally distributed with its mean, $330 million and its standard deviation, $45 million. Find the probability that the company's sales will be between $300 million and $ 400 next year?
A professor of statistics noticed that the marks in his course are normally distributed. He also noticed that his morning classes average 75% with a standard deviation of 13% on their final exams. His afternoon classes average 76% with a standard deviation of 12%. A. What is the probability that a randomly selected student in the morning class has a higher final exam mark than a randomly selected student from an afternoon class? Probability = .4761 B. What is the...
4. A top brand of a popular pickup truck's life is normally distributed with its mean, 12 years and standard deviation, 4 years. Suppose that the top executives of the automaker decided that only 1.2% of new trucks sold could be replaced with a new truck or fully refunded within the warranty period. What should be a desirable warranty period? 5. The grade distribution of a basic English course in a high school (total 3500 students) is normally distributed with...
1. The grade of a Math Quiz is normally distributed with its mean, 81 and standard deviation, 8.4. If a student is randomly selected in class, what is the probability that his or her score will be higher than 90? 2. The historical data of a company's annual sales is normally distributed with its mean, $330 million and its standard deviation, $45 million. Find the probability that the company's sales will be between $300 million and $ 400 next year?
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