6. A continuous random variable is uniformly distributed in the interval a < X < b. The lower quartile is 5 and the upper quartile is 9. Find
a) The values of a and b
b) P(6<X<7)
c) The cumulative distribution function, F(X)
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What is the solution to the system of the equations? x = y - 3 x + 3y = 13

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers