Ezekiel Anderson

Questions

• Why is the empirical rule important?
• 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?
• Use the empirical rule to determine the approximate probability that a z value is between 0 and 1 on the standard normal curve.
• How do I find the area under the normal distribution curve given the z-score or interval?
• Given a normal distribution with mean = 100 and standard deviation = 10, if you select a sample of n = 25, what is the probability that x-bar is between 95 and 97.5?
• How do you find the probability of #P( z< 1.45)# using the standard normal distribution?
• What is the mean of 158, 213, 107, 213, and 213?
• If you separate all the clubs from a deck of cards and pick 3 of those 13 cards, what is the probability that the cards are jack, queen, and king in ascending or descending order?
• The probability of event A occurring is 50%, and the probability of event B occurring is 25%. Events A and B are nonsimultaneous events. What is the probability that event A occurs but event B does not occur?
• You pick a card from a shuffled pack and draw a king. You put it back in the pack, shuffle, and then pick another card. This time you draw a queen. How are the two events of picking a king and picking a queen related?
• You want to make five-letter codes that use the letters A, F, E, R, and M without repeating any letter. What is the probability that a randomly chosen code starts with A?
• Two number cubes are rolled. What is the probability of rolling a sum of 9 or a sum that is even?
• What to do if a problem has a non-tabled degrees of freedom?
• A spinner has equal sections numbered 1-8. If you spin the spinner once, what is the probability that you will not get a 5?
• What is the mean of 17, 14, 3, 7, 24?
• A person visiting Las Vegas rolls the dice at a "craps" table and wonders what is the probability of rolling the dice 24 times without ever rolling a "7". Can the binomial distribution be applied to this situation?
• What is the mean, mode, range, and median of 55, 50, 58, 55, 60, 54, 56, 58, 58, 54?
• You reach into a bag of coins and withdrew two coins. What is the probability you withdrew a nickel and then a dime if the bag held ten pennies, six nickels, and five dimes?
• John's average score on three tests is 87%. What is the least he can score on his fourth test so that his average grade will be at least 90%?
• What is the median of the set of numbers: 127, 135, 142, 127, 109, 164, 155, 184, 155, and 169?
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