A common lab test during a medical exam is a blood count. The two main aspects are counting the number of white blood cells and differentiating white blood cells into several categories. One of the categories is neutrophils. Suppose 60% of white blood cells are neutrophils in a healthy person. What is the probability of seeing 2 neutrophils in a sample of three white blood cells from a healthy person? What is the probability of seeing 2 or fewer

This problem involves students who have taken Calculus in high school. Assume that 35 percent of students have taken calculus in high school. Of those who have taken calculus in high school, 75 percent plan to major in science. Of those who did not take calculus in high school, only 20 percent plan to major in science. What is the probability that a randomly selected student plans to major in science?

A social scientist gathers a carefully chosen group of 20 people whom she is selected to represent a broad cross section of the multiple of the population in New York City. She interviews them in depth for a study that she is doing regarding race relations in the city. Is there a probability sample? Explain your answer.

Below are the numbers of patients classified as underweight, normal weight, overweight and obese according to their diabetes status.  If a patient is selected at random: What is the probability that they are overweight? What is the probability that they are obese and diabetic? What proportion of the diabetics are obese? What proportion of normal weight patients are not diabetic? What proportion of patients are normal weight or underweight?     Underweight Normal Weight Overweight Obese Row Totals   Diabetic 8 34 65 43     Not Diabetic 12 85 93 40     Column Totals

A convenience store estimated that 22% of its customers come in to buy milk. What is the probability that out of the next 200 customers, 65 or fewer will buy milk?

A baseball player attempts 25 shots from the field during a game. This player generally hits about 33% of these shots.  What is the probability of this player hiting more than 13 shots (13,14,15,..., or 25)?

what is the probability of a baseball player getting three hits in a row if his batting average is 17.9%

In a recent year, speaking characters in movies were 68.2% male. What is the probability of randomly selecting a character with a speaking part and getting a female? What should be the value of that probability?

The weather report says that there is a 50% chance to rain tomorrow. What type of event is this?