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The mean IQ score of adults is 100, with a standard deviation of 15. Use the Empirical Rule to find the percentage of adults with scores between 70 and 130. (Assume the data set has a bell-shaped di
Suppose that on a statistics test the mean greade in a class is 75 and the population standard deviation is 8. Assume that the distribution of grades is bell-shaped.
The number of ships to arrive at a harbor on any given day is a random variable represented by x. The probability distribution for x is as follows. (Give your answer exactly.) x 24 25 26 27 28 P(x)
A particular genetic disease occurs in anyone who has one copy of gene A and two copies of gene B (genes A and B are independent). In a particular couple, both of the couple have one copy of gene B
Starting on day 1, you buy one lottery ticket each day. Each ticket is a winner with probability 0.1. Find the PMF of K, the number of tickets you buy up to and including your fifth winning ticket.
The number of lightning strikes in a year at the top of particular mountain has a poison distribution with parameter ?=2.9.Find the following.
Whether SAA choses to place an order 4 days in advance or not, they can still place an order at the original order point of 2 days before the game. Determine whether SAA should place an early order
If the baker randomly picks bagels for you, what is the probability that you will get what you like? How many 2 letter words could you design using english alphabet having 26 letters? Two same letter
What is the numeric value of k if the pmf is given as p(x) = k^2 for x = 3,4,5,6?
What is the probability that exactly half of the beech trees in the sample will be so damaged? What is the probability that two or more beech trees in the sample will be so damaged?
Assuming one buys exactly one ticket from each lottery, which one has the greatest probability of a win AND what is this probability?
The researchers also examined the effect of wine consumption on how tired men felt before & after lunch. Tiredness ratings indicated a significant main effect of: time, a main wine consumption,
Box 1 contains 1000 bulbs of which 10% are defective. Box 2 contains 2000 bulbs of which 5% are defective. Two bulbs are picked from a randomly selected box. Find the probability that both bulbs are
Assume that the average life expectancy of a Beagle is 13.3 years, and that 60% of Beagles lives to 12 to 15 years, and that their age follows normal distribution. Calculate the standard deviation o
Let a sample of size 4 be drawn with and without replacement from a box consisting of 6 balls, of which 4 are white. Let A denote the event that the ball drawn on the first draw is white, and let B
In the milk section of a self-service market there are 150 quarts, 100 of which are fresh, and 50 of which are a day old. If 2 quarts are selected, what is the probability that both will be fresh?
What is the expected number of hybrid rentals per day? Compute to one decimal place.
Two balls are drawn with replacement and without replacement from an urn containing 8 balls, of which 5 are white and 3 are black.
You roll a pair of fair dice until you roll "doubles" (i.e., both dice are the same). What is the expected number, E[N], of rolls? Please show your work.
In a soda filling process, the bottles have a nominal weight of 16 ounces. The process has a standard deviation of 0.2 ounces, where should the average be set such that 98% of the bottles will have
L is the number of flips of a fair coin up to and including the 33rd occurrence of tails. What is the PMF of L?
Find the following probabilities for a standard normal random variable Z. Note: Round your answers to four decimal places.
How many motels charged less than $60 per night? If the z-score for a motel is 0.8, what is the price of a single room at the motel (in dollars)?
In 2003, approximately 0.38% of the U.S. population had HIV/AIDS. Of these, it was estimated that 24.8% were not aware they have the disease. What is the probability that a randomly selected person
McDonalds Waiting Times. You want to estimate SD for the population of waiting times at McDonald's drive up windows. You want to be 95% confident that the sample SD is within 20% of SD. Find the min