At a particular university, students' grades…

Question

At a particular university, students' grades in introductory statistic classes are generally unimodal and skewed to the left with a mean of u = 63 and a standard deviation of o = 18.0. (Round to 2 decimal places for all z-values and round all other answers to 4 decimal places, if needed.)

(a) The distribution of students' grades is ______(b2).

(b) If n = 40 students are selected at random, the distribution of the sample mean grade is _______(b1) with a mean of ______ and a standard deviation of ____.

(c) The probability that the sample mean grade for these 40 students is less than 67.0 is ____.

(d) If n = 40 students are selected at random, the distribution of the sample total grade is ______(b1) with a mean of _______ and a standard deviation of ____.

(e) The probability that the total grade for these 40 students is less than 2680.0 is _____.

(b2) options= (left skewed) or (right skewed) or (may/may not be normal) or (exactly normal) or (approximately normal)

(b1) options= (left skewed) or (right skewed) or (not normal) or (approximately normal)

Answer 1

Hi Mish L.,

You've asked 5 questions here, and 7 questions, in great detail, on the same skill set, on successive days, without evidence you've even thought about the problems? That's spamming. Doing your entire problem set for you is first, forbidden under Wyzant rules, and second, won't help you acquire the skills you need. Ask one question, digest the lesson, and do the rest yourself -- that would be appropriate.

-- Cheers, --Mr. d.