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A company manufactures a batteries in batches of 20 and there is a 3 % rate of defects find the mean and standard deviation for the random variable x, the number of defects per batch.
Assume it costs $50 per student for the administrators to provide the course materials. How many students would have to register for the seminar for the university to break even?
Assume the population proportion for a presidential candidate is p=.50. Let p be the sample proportion likely voters favoring the presidential candidate. Show the sampling distribution of p
A normal distribution has a mean of m = 80 with s = 20. What score separates the lowest 30% of the distribution from the rest of the scores?
The average price of a gallon of unleaded regular gasoline was reported to be $3.13 in Illinois. Use this price as the population mean, and assume the population standard deviation is $.20.
All three classes took the same physics test. the mean score for the three class were 75, 71, and 78. Can the mean score for all tenth grade students be found by taking the mean of 75, 71 and 78
A researcher obtains an F-ratio with df = 2, 36 from an independent-measures research study. What is the total number of individuals who participated in the study?
What is the probability that the mean price for a sample of 30 service stations is within $.03 of the population mean?
For repeated random samples of three bottles, what is the variation in the number of bottles out of three that have less than 12 ounces?
A new grug had a potency advertised at 75%. Given the following smaple data. Check manufacturer's claim of 775% potency at alpha = .05 (one tail). Make a 90% confidence interval.
A life insurance company wants to update its actuarial tables. Assume that the probability distribution of the lifetimes of the participants is approximately a normal distribution with a mean of 71
find the three missing frequencies of the table, given that median=33.5 , and mode = 34. Also calculate the mean using the empirical relationship between mean, median and mode.
Question: Test the claim that 14% of a candy makers candies are red. Use a 0.05 significance and the table to answer the following questions: A: what is the test statistic B: What is the z-value
Management is considering placing a new hire in an upper level management position if the person scores in the upper 6 percent of the distribution. What is the lowest score a college graduate must e
For some types of plants, when plants with different colored flowers are crossbred, one color does not dominate over the other.
An insurance company wants to determine if their clients now have a longer life expectancy, on average, so they randomly sample 20 of their recently paid policies. The sample has a mean of 78.6 yea
Let X represent the number that occurs when a green die is tossed and Y the number that occurs when a red die is tossed. What is the variance of the random variable X-2Y?
a. What is the expected value of this game? b. What is the house edge for this game, expressed as a percentage of $1?
Find the probability that exactly k white balls will be drawn before the black one is if (a) each ball is replaced before the next ball is drawn and (b) balls are not replaced.
There are 25 people in a room. What is the probability that at least two have the same birthday?
To play a lottery game a player must choose 6 numbers between 1 and 49. The order is not important. Six numbers between 1 and 49 will turn out to be winning numbers for a particular game. If you pl
It has been recorded that 10 people get killed by shark attack every year. What is the probability of having 5 or 6 people get killed by shark attack this year?
Find the number of ways to draw: a. A 5-card hand consisting of spades only b. A 4-card hand with 2 aces and two queens
The employees of Cartwright Manufacturing are awarded efficiency ratings. The distribution of the ratings approximates a normal distribution. The mean is 400, the standard deviation 50. What is the
A multiple-choice test consists of 12 questions with 4 possible answers to each question. In how many ways can the test be completed?