Question

Almost all medical schools in the United States require students to take the Medical College Admission Test (MCAT). To estimate the mean score ? of those who took the MCAT on your campus, you will obtain the scores of an SRS of students. The scores follow a Normal distribution, and from published information you know that the standard deviation is 10.4 . Suppose that, unknown to you, the mean score of those taking the MCAT on your campus is 510 .

In answering the questions, use ?‑scores rounded to two decimal places.

(a) If you choose one student at random, what is the probability that the student's score is between 505 and 515 ? Use Table A, or software to calculate your answer.

(b) You sample 25 students. What is the standard deviation of the sampling distribution of their average score ?¯ ? (Enter your answer rounded to two decimal places.)

(c) What is the probability that the mean score of your sample is between 505 and 515 ? (Enter your answer rounded to four decimal places.)

Answer #2

Given that, mean (μ) = 510 and standard deviation = 10.4

a) We want to find, P(505 < X < 515)

Therefore, required probability is **0.3688**

b) If sample size (n) = 25, the standard deviation of the sampling distribution of their average score is,

=> Standard deviation = **2.08**

c) We want to find,

Therefore, required probability is **0.9836**

answered by: anonymous

Almost all medical schools in the United States require students
to take the Medical College Admission Test (MCAT). To estimate the
mean score ?μ of those who took the MCAT on your campus, you will
obtain the scores of an SRS of students. The scores follow a Normal
distribution, and from published information you know that the
standard deviation is 10.4. Suppose that, unknown to you, the mean
score of those taking the MCAT on your campus is 510.
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