Test scores on a certain test are normally distributed with a mean of 25 and a...
Test scores on a certain test are normally distributed with a mean of 25 and a standard deviation of 5. Find the probability that the mean of a sample of 30 tests is between 27.6 and 32.4. Group of answer choices
0.2222
0.0022
0.9306
0.2321
Homework Answers
Hence option two is correct
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Test scores on a certain test are normally distributed with a
mean of 25 and a...
the scores on a certain test are normally distributed with a mean score of 65 and...
the scores on a certain test are normally distributed with a mean score of 65 and a standard deviation of 2. what is the probability that a sample of 90 students will have a mean score of at least 65.2108.
5. Suppose a set of math test scores is normally distributed with a mean of 100...
5. Suppose a set of math test scores is normally distributed with a mean of 100 (you do not need to know the standard deviation to answer this question, but you may find it helpful to plug in a standard deviation of your choice). If you randomly select a sample of scores from this distribution, which of the following probabilities is higher? Explain your answer. • The probability of the sample mean falling between 100 and 105 with a sample...
The scores on a certain test are normally distributed with a mean score of 53 and...
The scores on a certain test are normally distributed with a mean score of 53 and a standard deviation of 2. What is the probability that a sample of 90 students will have a mean score of at least 53.2108? 0.8413 0.3174 0.3413 0.1587
Question 12 6 pts The scores on a certain test are normally distributed with a mean...
Question 12 6 pts The scores on a certain test are normally distributed with a mean score of 65 and a standard deviation of 2. What is the probability that a sample of 90 students will have a mean score of at least 65.2108? 0.1587 0.3174 0.3413 0.8413
3. Exam scores on a certain test are distributed normally, with a mean of 72 and...
3. Exam scores on a certain test are distributed normally, with a mean of 72 and a standard devi- ation of 12. (a) Find the 95th percentile for the exam. (b) Suppose a student who took the exam is selected at random. Find the probability that the student scored between 71 and 73. Draw a graph that illustrates the probability calculated. (C) If you take a simple random sample of 36 students who have taken this exam, what is the...
Scores on a certain test were normally distributed with a mean of 80 and a standard...
Scores on a certain test were normally distributed with a mean of 80 and a standard deviation of ± 8. The probability is 90% that a randomly selected student will get a score lower than __________________ Give the answer to at least one decimal place.
Scores on a certain test were normally distributed with a mean of 80 and a standard...
Scores on a certain test were normally distributed with a mean of 80 and a standard deviation of ± 12. What is the probability that a given student got a score more than 80? Your answer should be correct to four decimal places.
Scores on a certain test were normally distributed with a mean of 80 and a standard...
Scores on a certain test were normally distributed with a mean of 80 and a standard deviation of 8. What is the probability that a randomly selected student got a 92 or higher? (4 decimal places)
a.) Test scores are normally distributed with a mean of 60 and a variance of 225....
a.) Test scores are normally distributed with a mean of 60 and a variance of 225. Joe scored at the 90th percentile which means that his score was? b.) Suppose X is normally distributed with mean 4 and standard deviation 4. Find the probability that 2X exceeds 7. c.) Test scores are normally distributed with a mean of 60 and a standard deviation of 15. Joe scored at the 95th percentile which means that his score was d.) a random...
LSAT test scores are normally distributed with a mean of 152 and a standard deviation of...
LSAT test scores are normally distributed with a mean of 152 and a standard deviation of 5. Find the probability that a randomly chosen test-taker will score 147 or lower. (Round your answer to four decimal places.)
5. Suppose a set of math test scores is normally distributed with a mean of 100 (you do not need to know the standard deviation to answer this question, but you may find it helpful to plug in a standard deviation of your choice). If you randomly select a sample of scores from this distribution, which of the following probabilities is higher? Explain your answer. • The probability of the sample mean falling between 100 and 105 with a sample...
The scores on a certain test are normally distributed with a mean score of 53 and a standard deviation of 2. What is the probability that a sample of 90 students will have a mean score of at least 53.2108? 0.8413 0.3174 0.3413 0.1587
Question 12 6 pts The scores on a certain test are normally distributed with a mean score of 65 and a standard deviation of 2. What is the probability that a sample of 90 students will have a mean score of at least 65.2108? 0.1587 0.3174 0.3413 0.8413
3. Exam scores on a certain test are distributed normally, with a mean of 72 and a standard devi- ation of 12. (a) Find the 95th percentile for the exam. (b) Suppose a student who took the exam is selected at random. Find the probability that the student scored between 71 and 73. Draw a graph that illustrates the probability calculated. (C) If you take a simple random sample of 36 students who have taken this exam, what is the...
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