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A student has 40% chance of getting a scholarship. Consider a group of 10 students. What is the probability that exactly 3 students would get scholarships?
The distribution of the sum of independent N(?, ?2) random variables is:
Write down the pdf for each of the following distributions, then sketch the distributions on the axes provided (be sure to indicate which is which). a) N(2,9), b) N(0,1)
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 mi
Mrs. Smith's reading class can read an average of 175 words per minute with a standard deviation of 20 words per minute. Suppose that words per minute is approximately normally distributed. The top
Calculate the standard deviation for the following sample, and show your work. Use the formula of your choice. Use the empty cells to facilitate your calculations.
The probability that a radish seed will germinate is 0.7. The gardner plants 140 seeds, what is the probability that she harvests less than 100 radishes. Use the normal curve approximation for biono
The Body Mass Index (BMI) was recorded for 40 males. Find the 5-number summary that would be used for a box plot of this data.
List the measures of center from the least affected by outliers to the most affected by outliers.
A student gets quiz grades of 55,70,82, and 94. He gets a score of 85 on his final exam. Find the weighted mean if the quizzes each count 15% and the final exam counts for 40% of the final grade.
The z-score for a particular number (x) is -1.25, where the values have a mean of 175.0 and a standard deviation of 12.0. Find the particular number (x)
Give a 95% confidence interval for the mean blood phosphorus level for 5.4 5.2 2.5 4.9 5.7 and 6.3 mg/dL. Also, what sample size would be needed for a margin of error of 0.25 mg/dL for 95% confidenc
In a sample of 400 people, 250 indicated that they prefer domestic wines, while 140 said they prefer European wines, and 10 indicated no preference. we want to use the sign test to determine if ther
The percentage of squirrels that test positive for rabies is 6%. What is the probability that for the next 10 squirrels examined, at most 2 test positive for rabies?
A manufacturer claims the average life of a product is 500 hours. The lifetime of the product is assumed to follow an exponential distribution. What is the probability that the product will last les
The salespeople at Quality Motor Bikes sell up to 5 bikes a month. The probability distribution is as follows in the table below. What is the expected number of bikes sold during a month?
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
As part of a study of grade inflation, you want to estimate the mean GPA of all current college student in the U.S. All GPAS are to be standardized for a scale between 0 and 4.
The following table shows part of the probability distribution for a random variable x. The mean of the above distribution is known to be 1.8 (i.e., E(x) = 1.8). Determine f(1) and f(3).
An eight-cylinder car has two cylinders that are defective and need to be replaced. If the mechanic randomly selects two cylinders in a row without replacement, to test for repair, what is the proba
Super Cola sales breakdown is 80% regular soda and 20% diet soda. Of the regular soda, 60% are purchased by men. Of the diet sodas, 30% are purchased by men. If a woman purchases Super Cola, what is
Nine coins are tossed. Let X be the number of coins that turn up heads. Find P(X = 4) and P(X = 6).
Suppose the lifetime of a particular appliance follows an exponential distribution with a mean of 10 years. What is the probability that the appliance will fail in less than 5 years?
The data in the table below indicate total cholesterol level for each participant before and after taking the herb. Is there a significant difference in total cholesterol after taking the herb? Use
Suppose that 30% of a group of people have hazel eyes. Assume that passengers boarding the plane form a randomly chosen group. What is the probability that passenger 17 is the 3th one having hazel e