Probability, Random Variables, and Probability Distributions
What is an advantage of using stratified random sampling over simple random sampling when investigating voter preferences among different age groups?
A jar contains blue and red marbles only; if you have twice as many blue marbles as red ones and you randomly select one marble, what is the expression for calculating the probability that it will be blue?
A student records the number of text messages they receive each day for a week and wants to calculate the variability; which measure would be most appropriate?
What is the probability of an event occurring if all outcomes in the sample space are equally likely to happen?
If a sample space has 17 equally likely outcomes, and a event consists of 9 of those outcomes, what is the probability of the event happening?
A jar contains only green and yellow gumballs. If there are twice as many green gumballs as yellow ones, what is the probability that two randomly selected gumballs will both be green?
What must the probabilities of all possible outcomes in a sample space add up to?
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If two events A and B are independent, which of the following is true?
When rolling two six-sided dice, what is the probability of obtaining a sum of 7?
A bag contains 6 red, 4 blue, and 5 green marbles; a marble is drawn at random and then replaced before drawing another one; what is the probability of drawing a blue marble both times?