In an experiment, a person guesses which one of three differ…

In an experiment, a person guesses which one of three different cards a researcher has randomly picked (and hidden from the person who guesses).  This is repeated four times, replacing the cards each time.  Let X = the number of correct guesses in the four tries.  The probability distribution for X, assuming the person is just guessing, is partially provided below. X 0 1 2 3 4 P(X) 0.20 0.39 0.30 0.10   a.   What is the missing probability?   b.   What is the probability that the person would get at least 3 correct guesses?     c.   What is the probability that the number of correct guesses is at most 2?

Susan Brown is a 29 year old female who comes into your offi…

Susan Brown is a 29 year old female who comes into your office for a routine cleaning and exam.  As part of your initial exam, you do a preliminary occlusal analysis. You begin by having Mrs. Brown close into habitual occlusion where she has the maximum number of teeth contacting.  This position is known as:

In a survey, students are asked how many hours they study in…

In a survey, students are asked how many hours they study in a typical week.  A five-number summary of the responses is:  Min = 2, = 9, Median = 14,  = 20, Max = 60   Question: Which interval describes the number of hours spent studying in a typical week for about 50% of the students sampled?