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What is the probability that when creating a string permutation consisting of all of the lowercase letters of the alphabet, a and z are separated by 21 letters in the permutation?
Determine the probability that a random committee haves all males? Assume that the committee should have one President which has to be a female as well as two ordinary members who should be males. Ho
Classic golf inc manages 5 courses in the jacksonville florida area. The director of gof desires to study the number of rounds of golf played per weekday at five courses.
Determine the z-score for each student and indicate which one has a better relative position. An Art Major earned a grade of 46 on an exam with = 50 and s = 5; A Theater Major earned a grade of 70 o
A student scored 84 points upon a test where the mean score was 79 and the standard deviation was 4. Determine the student's z score, rounded to two decimal places, and place it in the blank.
The mean score for freshman upon aptitude test, at a certain college is 540 with the standard deviation of 50. Determine the probability that two groups of students chosen at random consisting of 32
Suppose that a single fair die is tossed 30 times. Let X denote the number obtained per toss. Assume that x(bar) assumes the value 2.83 for these 30 tosses. Determine a 95% confidence interval for t
The between groups sum of squares was computed to be 1,170.5, and the WITHIN groups sum of squares was calculated to be 8,470.1. (NOTE: These are not the mean sum of squares)
Previous studies consider that vegetarians might not receive enough zinc in their diets. As the zinc requirement is particularly significant during pregnancy, researchers conducted a study to find o
True or False: The 5-number summary includes the smallest observation, the first quartile, the median, the third quartile, and the largest observation.
In the initial test of salk vaccine for polio, 400,000 children were chosen and divided in two groups of 200,000. One group was vaccinated with the Salk vaccine while second group was vaccinated
Scores upon the standford-binet intelligence scale have a mean of 100 and standard deviation of 16, and are supposed to be normally distributed. A person who scores 68 on this scale has what percent
A statistics teacher current adopted a new textbook. At the completion of the course, 100 randomly selected students were asked to assess the book. The results showed:
The mean teaching hours for the full time faculty at a state university is eight hours per week. What does this tell you regarding the typical teaching hours for full time faculty at that university
Match the proposed probability of A with the appropriate verbal description.
Adults have Intelligent test scores which are normally distrubted with mean of 100 and standard deviation of 15. Determine probability that a randomly selected a adult has an IQ less than 110
Ten hunters are waiting for ducks to fly by. When flock of ducks flies overhead, the hunters fire at same time, but each selects his target at random, independently of the others. If each hunter ind
Assume three fair dice are tossed repeatedly. Let the random variable X denote the roll on which a sum of 4 appears for the first time. Use the expression Fx(t) = P(X <= t) = 1 - (1 - p)^[t], wh
A pet supplier has a stock of parakeets of which 10% are blue parakeets. A pet store orders 3 parakeets from this supplier. If the supplier selects the parakeets at random, what is the chance that t
A bookcase haves 3 statistics books and 5 biology books. If 2 books are chosen at random, the chance that both are statistics books.
In second grade class containing 12 girls and 9 boys, 2 students are chosen at random to give out the math papers. What is the probability that both are girls.
A school administrator says that standard deviation of test scores for eighth grade students who took a life science assessment test is less than 30. You work for the administrator and are asked to
A recent poll found that 30% of those surveyed are worried regarding aggressive drivers upon the road. If three people are selected at random, that is the probability that all three will be worried
A study was carried out to determine if curing temperature significantly affects tensile strength of silicone rubber. An axially controlled automated hydraulic force applicator was employed to measu
A magazine reports that 5% of U.S. adults say they have seen extraterrestrial being. You decide to test this claim, and ask random sample of 250 U.S. adults whether they have ever seen an extraterres