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
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 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 (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
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...
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
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.
In a recent year, the total scores for a certain standardized test were normally distributed, with a mean of 500 and a standard deviation of 10.3. Answer parts (a)dash(d) below. (a) Find the probability that a randomly selected medical student who took the test had a total score that was less than 492.
Math 100 test scores are normally distributed with a mean of 75 and a standard deviation of 7: a) Find the probability that a grade is between 65 and 80 b) Find the grade that is the 30th percentile
In a recent year, the total scores for a certain standardized test were normally distributed, with a mean of 500 and a standard deviation of 10.5.(a) Find the probability that a randomly selected medical student who took the test had a total score that was less than 490 (b) Find the probability that a randomly selected medical student who took the test had a total score that was between 497 and 511(c) Find the probability that a randomly selected medical student...
Cars of a certain type have mileage that are normally distributed with a mean of 23.9 mpg with a standard deviation of 1.2 mpg. If 13 cars of this type are randomly selected, find the probability that their mean mileage is between 24 mpg and 26 mpg. Group of answer choices 0.3085 0.3821 0.428 0.1357