The product yield was measured for a reaction whereby the temperature, pressure and reaction time were varied.   Temperature (oC) Pressure (atm) Reaction time (h) Product yield (%) 30...

multiple choice

Here goes:   I have a team composed of 5 players. Each player has played in a pool of hundreds of thousands of players, hundreds of games, say 500 games. Every time that player was teamed...

The daily protein intake of children aged 11-15 in a rural community follows a normal distribution with a mean of 27 grams and a standard deviation of 7 grams. What percent of these children get less...

The cost of 5 gallons of ice cream has a variance of 49 with a mean of 31 dollars during the summer. What is the probability that the sample mean would differ from the true mean by more than...

According to a recent study, 9.3% of high school dropouts are 16- to 17-year-olds. In addition, 6.4% of high school dropouts are white 16- to 17-year-olds. What is the probability that a randomly...

a. What is the probability that Xbar is less than 49?   b. What is the probability that Xbar is between 49 and 50.5?   c. c. What is the probability that Xbar is above...

A livestock company reports that the mean weight of a group of young steers is 1086 pounds with a standard deviation of 55 pounds. Based on the model N(1086,55) for the weights of steers, what percent...

A computer is programmed to produce at random a single digit from the list 0,1,2,3,4,5,6,7,8,9. The program runs twenty times. Let Y be the number of zeros that occur. a) State the distribution...

The heights of a certain type of tree can be assumed to follow a normal distribution. How comes on cannot say, the heights follow a normal distribution? Why should we make the assumption?

6. A psychology professor of a large class became curious as to whether the students who turned in tests first scored differently from the overall mean on the test. The overall mean score on the test...

6. A psychology professor of a large class became curious as to whether the students who turned in tests first scored differently from the overall mean on the test. The overall mean score on the test...

The lifetime of a certain brand of electric light bulb is known to have a standard deviation of hours. Suppose that a random sample of bulbs of this brand has a mean lifetime of...

Make a table showing the sample size needed to get a given margin of error ranging from 4% to 5% going up by 0.1%. Assume that that the confidence level is 95%. Round to the nearest whole number....

At one point the average price of regular unleaded gasoline was \$ 3.61 3.61 per gallon. Assume that the standard deviation price per gallon is \$ 0.05 0.05 per gallon and use Chebyshev's...