Statistics homework problem please help!
Statistics homework problem please help!
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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