Statistics homework problem please help!

Posted on 2014-04-04 06:45:00 in Statistics by MIJI

Let x be the number of courses for which a randomly selected student at a certain university is registered. The probability distribution of x appears in the following table.

x 1 2 3 4 5 6 7

p(x) .02 .03 .09 .25 .41 .15 .05

It can be easily verified that = 4.65 and = 1.19.

(a) Because - = 3.46, the x values 1, 2, and 3 are more than 1 standard deviation below the mean. What is the probability that x is more than 1 standard deviation below its mean?





(b) What x values are more than 2 standard deviations away from the mean value (i.e., either less than - 2 or greater than Select all that apply.)

x = 1

x = 2

x = 4

x = 5

x = 6

x = 7

What is the probability that x is more than 2 standard deviations away from its mean value?

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