14) What is the numerical value of X in the following relative frequency distribution? Class Freq Rel Freq 1-10 68 0.17 11-20 24 0.06 21-30 12 B 31-40 A X 41-50 16 0.04 15) Using the Visual Quartile Method, what is the interquartile range the following values? 0.05 0.06 0.07 0.12 0.16 0.16 0.21 0.23 0.27 0.30 0.31 0.35 0.37 0.39 0.41 0.46 0.46 0.46 0.49 0.50 0.53 0.53 0.58 0.62 0.63 0.67 0.69 0.73 0.78 0.78 0.79 0.81 0.84 0.86 0.86 0.86 0.89 0.92 0.94 0.99 16) If P(A) = 0.4, P(B) = 0.5 and P(A or B) = 0.85, what is P(A|B)? 17) Assume that birthdays are evenly distributed among the days of the week. If we randomly picked 4 people, what is the probability that they were either all born on Monday or all born on Tuesday? 18) If four cards are selected at random without replacement from a standard deck, what is the probability that they will all be red cards