It would mean a lot really (also have more questions on my page)

  D.  Neither group of colleges satisfies her criterion.

Step-by-step explanation:

The probability of admission to at least one of the colleges in the group is the complement of the probability of being admitted to none. That probability is the product of the probabilities of rejection from the colleges in the group.

Group VW

The probabilities of rejection from V and W are 0.6 and 0.75, so the probability of rejection by both is 0.6×0.75 = 0.45. The complement of that, the probability of admission to V or W (or both) is 1 - 0.45 = 0.55, which is less than 60%.

Group XYZ

The probabilities of rejection are 0.7, 0.8, and 0.8, so the probability of rejection by all of X, Y, and Z is 0.7×0.8×0.8 = 0.448. The complement of that, the probability of admission to X, Y, or Z is 1 -0.448 = 0.552, which is less than 60%.

Since neither group of colleges will have a probability of admission of 60% or more, neither group of colleges will satisfy her criterion.

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.