2. For a freshman taking introductory statistics and majoring in psychology, let X equal the student's ACT mathematics score and Y the student's ACT verbal score. Assume that X and Y have a bivariate normal distribution with µ. = 22.7, o = 17.64, µy = 22.7, ož = 12.25, and p = 0.78. %3D (a) distribution. Represent P(18.5 < Y < 25.5) by using the CDF of the standard normal (b) Find E[Y]æ]. Find Var(Y|a). (d) Represent P(18.5 < Y < 22.5|X = 23) by using the CDF of the standard normal distribution. (e) Represent P(18.5 < Y < 22.5[X = 25) by using the CDF of the standard %3D

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Permutations and Combinations

If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.

Counting Theory

The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.