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A sample of university students has an average gpa of 2.78 with a standard deviation of 0.45, If they have a GPA that falls in the range between 2.50 and 3.50, what is their z score and percentage of the area do they fall in?
Statistics and Probability, Statistics
Armstrong Faber produces a standard number-two pencil called Ultra-Lite. The demand for Ultra-Lite has been fairly stable over the past ten years. On average, Armstrong Faber has sold 457,000 pencils each year. Furthermo ...
The mean height of women in a country? (ages 20-?29) is 63.5 inches. A random sample of 65 women in this age group is selected. What is the probability that the mean height for the sample is greater than 64 ?inches? Assu ...
Amy currently has $500 in an account with an annual rate of return of 4.3%. She wants to have $3000 for a trip to Florida when she graduates in 2 years. How much will she have to save each month to afford her trip?
A random sample of 18 eighth grade? students' scores on a national mathematics assessment test has a mean score of 269. This test result prompts a state school administrator to declare that the mean score for the? state' ...
Let's assume that your tuition (not including books and supplies) for this semester is $7500. If you are taking 5 courses, and each class meets 3 hours a week, what are you paying per hour for your classes? (A typical co ...
While preparing for their comeback tour, the flaming Roger's find that the average time it takes their sound tech to set up for a show is 61 minutes, with a standard deviation of 4.1 minutes. If the band manager decides ...
A study discovered that Americans consumed an average of 10.7 pounds of chocolate per year. Assume that the annual chocolate consumption follows the normal distribution with a standard deviation of 3.1 pounds. Complete p ...
Five houses in a row are each to be painted with one of the colors? red, blue,? green, and yellow. In how many different ways can the houses be painted so that no two adjacent houses are of the same? color? Answer is 324 ...
A CPU manufacturing company knows, based on the machines working at maximum productivity, that 90% of the CPU's coming off the line meet quality standards. The quality control inspector pulls 25 CPU's off the line to tes ...
Would you actually build a contingency chart for this question or is this just probability basics? Bob sets two battery powered alarm clocks to make sure he wakes up in time for his 8 AM accounting test. Each alarm clock ...
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