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Find the mean and standard deviation for the number of correct answers for such students
Assume that a procedure yields a binomial distribution with n trails and the probability of success for one trial is p. Use the given values of n and p to find the mean and standard deviation.
Find the mean and the standard deviation for the number of times this letter will be found on a typical page of 1800 characters.
A online DVD company has on average in inventory of $10,000,000 and an inventory turn of 3. The DVD company thinks they can do video on demand and lower their inventory to $5,000,000 for their same
A candy company claims that 16% of its plain candies are orange, and a sample of 200 such candies is randomly selected. Find the mean and standard deviation for the number of orange candies in such gr
A brand name has an 80% recognition rate. If the owner of the brand wants to verify that rate by beginning with a small sample of 5 randomly selected consumers, find the probability that exactly 4 o
Adult IQ scores have a bell-shaped distribution with mean of 100 and a standard deviation of 15. Use the empirical rule to find the percentage of adults with IQ scores between 70 and 115
The fixed cost is $200,000 Yr. The variable cost of a personal pizza drink combo is 50 cents. The revenue of the pizza/drink combo is $1.00. I need to make 11% annual return on my $1,000,000 investm
In 2002, USA Today reported that about 66% of American high school graduates go to college and that 6% of Americans have hazel eyes. Assuming this is true, how many high school graduates would I nee
In one sample of mobile homes in the Los Angeles area, the mean NO2 concentration in kitchens during the summer was 38.84 ppb, and the standard deviation was 11.44. Making no assumptions about the s
Find the indicated probabilities using geometric distributuion or possion distribution a major hurracane with a speed of 111 miles per hour or greater. During the last century, the mean number of ma
The diameters of grapefruits in a certain orchard are normally distributed with a mean of 7.25 inches and a standard deviation of 0.75 inches. Show all work. What percentage of the grapefruits in th
Four missiles are fired at a target. If the probabilities of hitting the target are 0.4, 0.5, 0.6 and 0.7 respectively and if the missiles are fired independently then what will be the probability t
In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 44 and a standard deviation of 11.
Find the percentage of IQ scores that are below 90. (Round your z-score to nearest hundreth and covert table probability to a percent)
Find the percentage of IQ scores that are below 120. (Round your z-score to nearest hundreth and convert table probability to a percent.)
Start with x = 100 and add four x values to make a sample of five data such that the standard deviation of these data equals 0? I am lost on where to even start.
The coffee/soup machine at the local bus station is supposed to fill cups with 6 ounces of soup. Ten cups of soup are brought with results of a mean of 5.93 ounces and a standard deviation of 0.13 o
If two events are mutually exclusive, then the union of those two events is the sum of the individual probabilities of these two events.
A large statistics class took an exam. The scores followed a normal curve with mean 78 and standard deviation 10. Students who scored 90 or above got an A on the exam. Those who scored between 80 a
Scores on IQ tests have a symmetric distribution that is roughly bell-shaped. Reported IQs are scaled so that the distribution has a mean of 100 and a standard deviation of 15. Suppose that a standa
Find the probability that in a given year A exactly one major hurricane will strike the mainland, B at most one hurricane will strike the mainland, C mor than one major hurricane will strike mainlan
Consider a guessing game, where a number between 2 and 12 is chosen by rolling two dice. Try to find the best strategy for a player to guess the number.
Recently, the use of mammograms to screen for breast cancer was in the news. Let's suppose that 1% of women aged 30 - 40 have breast cancer and that a mammogram detects 90% of all cancers.
The scores on the Wechsler Adult Intelligence Scale are approximately Normal with \mu = 100 and \sigma = 15. What is the proportion of adults with scores between 90 and 110?