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Find the probability that a given class period runs between 51.25 and 51.75 minutes.
A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 49.0 and 59.0 minutes.
A researcher has observed independent samples of females and males recording how long each person took to complete his or her shopping at a local mall. Using the .05 level of significance, would fem
Someone has a weighted coin that lands heads up with a probability of 2/3 andtails up with aprobability of 1/3. If the coin comes up heads you pay $1 dollar ; if the coin comes up tails you receive
In a city, 50% of people have Master cards, 60% have Visa cards, and 43% have both. What percentage of people have at least one of the two types of credit cards (Master, Visa)?
The probability that the student knows the answer is .80 and the probability that the student will guess is .20. Assume that if the student guesses, the probability of selecting the correct answer i
Steve Goodman, production foreman for the Florida gold Fruit Company, estimates that the average sale of oranges is 4,700 and the standard deviation is 500 oranges. Sales follow a normal distributio
An industrial oven used to cure sand cores for a factory manufacturing engine blocks for small cars is able to maintain fairly constant temperatures.
Write a brief scenario of a real world issue using a one-way analysis of variance (ANOVA) that includes clearly identified independent and dependent variables, the number of levels of the independen
Calculating the coefficient of variation between heights and the weights of certain students in the ata below. Can you you conclude that the heights are more varied than the weights?
Assume grades in a college accounting class are normally distributed with a mean of 82 and a standard deviation of 7. What is the probability that a randomly selected student from this class will ha
What is the probability of getting at least one six in a single throw of three unbiased dice?
Safety and security specialists estimate that the prior probabilities of static electricity, malfunctioning electrical equipment, open flame, and sabotage to be .30, .40, .15, and .15 respectively.
A women tests positive on this screening test. Calculate her probability of having cancer.
Let L be a list of the 26 letters in the English alphabet which consists of 5 vowels and 21 consonants . Show that has a sublist consisting of four or more consecutive consonants. Assuming L begins
Find the minimum number of integers to be selected from S = {1,2,.....,9} so that the sum of two of the n integers is even.
At each of five defense stations, the probability of downing an attacking airplane is 0.10. If a plane has to pass all five stations before arriving at its target, what is the probability that it ge
A restaurant prepares a tossed salad containing on the average 5 vegetables. Find the probability that the salad contains more than 5 vegetables on 3 of the next 4 days and for the first time in Apr
The average number of oil tankers arriving each day at a certain port city is known to be 10. The facilities at the port can handle at most 15 tankers per day.
Is there evidence that the mean amount is different from 1.0 gallon (use alpha=0.01)? Compute the p value and interpret its meaning.
Assuming the you know nothing about where these co-workers have parked, what is the probability that you will find both spaces on either side of your car unoccupied ?
Is there evidence that the population mean amount is less than 25.3 hours? Use a 0.05 level of significance. Determine the p-value and interpret its meaning.
A ternary string is a sequence of digits where each digit is either 0, 1, 2. Count the number of ternary strings of length n whose first 4 digits are all the same for n > 4. Count the number of t
What is the break-even quantity (produced and sold)? And what are total revenues for the break-even quantity? What quantity would be required for a profit of $2,000?
A new medication gives 10% of the users an undesirable reaction. If a sample of 14 users receive the medication, find the probability of: