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What is z value corresponding to the 65th percentile of the standard normal distribution?

Assume that IQ scores are normally distributed, with a mean #mu# of 100 and standard deviation #sigma# of 15. What is the probability that a randomly selected person has an IQ score between 105 and 110?

What is the meaning of conditional probability?

If we are interested in calculating the probability that a first success occurs on the 6th trial, what do we know about the outcomes of the first 5 trials?

In a jar are 10 marbles: 4 red, 5 blue, and 1 yellow. Why can we use the special addition rule to calculate the probability that a single marble drawn from the jar will be either red or yellow? What is the probability?

Use your common sense to answer this question. Are the events "Rain" and "Having a Car Accident" independent or dependent?

What must the frequencies in a frequency distribution add up to?

You stand at the basketball freethrow line and make 30 attempts at at making a basket. You make 3 baskets, or 10% of your shots. Is it accurate to say that three weeks later, when you stand at the freethrow line, that the probability of making a basket on your first attempt is 10%, or .10?

You weigh 30 people who exercise every day, and you weigh 30 people who do not get regular exercise. The exercise group has a mean weight which is 22 pounds less than the nonexercise group's mean. Can you conclude that exercise causes people to weigh less?

Assume that a gallon of milk bought at the store goes bad some time in the interval from 5 days to 10 days after purchase. What is the standard deviation of this distribution?

The last 3 times you went to the dentist for your 6month checkup, it rained as you drove to her office. What is the probability that it will rain while you are driving to today's dental appointment?

How is a zscore useful in comparing two different distributions?

What is wrong with the answer choices to the question: How much did you like your statistics course this semester? (A.) Not at all (B.) A lot (C.) It was awesome!

If a histogram is unimodal and symmetric, what wellknown curve will the histogram approximate?

What is the probability of an impossible event?