Exam 10: Introducing Probability

A random sample of horses admitted to a local veterinary hospital found the following distribution of mares, geldings, and stallions. The probability that a horse newly arriving at the veterinary hospital is a male (gelding or stallion) is:

The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio, varies according to the Normal distribution with mean 21 and standard deviation 10. The value of P(X < 10) is:

An urn contains 3 red, 2 blue, and 5 green marbles. If we pick 4 marbles with replacement and count the number of red marbles in the 4 picks, the probabilities associated with this experiment are P(0) = 0.24, P(1) = 0.41, P(2) = 0.265, P(3) = 0.076, and P(4) = 0.009. The probability of 2 red marbles or less is:

When we draw a card from a deck, the outcome is uncertain. The card's value is:

An urn contains 3 red, 2 blue, and 5 green marbles. If we pick 4 marbles with replacement and count the number of red marbles in the 4 picks, the probabilities associated with this experiment are P(0) = 0.24, P(1) = 0.41, P(2) = 0.265, P(3) = 0.076, and P(4) = 0.009. The probability of less than 2 red marbles is:

About 64% of boys aged 12 to 15 years regularly play video games. If we select a single boy in this age group, the probability that he regularly plays video games is: