6. A standard pack of 52 playing cards is used. What is the probability that: (a) If two cards are picked, that they are both spades?
(b) If two cards are picked, that they are of the same suit?
(c) If three cards are picked, that they are all of the same suit?
(d) If two cards are picked, then they are a pair i. e. two cards with the same value?
(e) If four cards are picked, then they are two from each of two different suits? [hard]

Find the quotient. 50a2 – 98b2 -5a +7b

Two language majors, anna and megan, took exams in two languages. anna scored 85 on both exams. megan scored 74 on the first exam and 85 on the second exam. overall, student scores on the first exam had a mean of 82 and a standard deviation of 4, and the second exam scores had a mean of 71 and a standard deviation of 13. a) to qualify for language honors, a major must maintain at least an 85 average across all language courses taken. so far, which of anna and megan qualify? b) which student's overall performance was better?

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?