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Assume that the mean score on a normally distributed statistics quiz taken by 400 psychology students was 76, and the standard deviation was 8. Ben had a z-score of -1.2.
If someone gave a passing grade only to the top 25% of the class, what is the lowest score that would be considered passing?
What scores cutoff the middle 40% of grades?
Lowest grade:
Highest grade:
What proportion of students scored outside of the area between scores 66 and 86?
suppose a bar buys 10 of these sony tvs what is the probability that the average life time of the bar's tv is less than 19,650 hours.
An entrepreneur is considering the purchase of a coin-operated laundry. The present owner claims that over the past 5 years, the average daily revenue was $675 with a standard deviation of $75.
It is expected that dividends will grow at 4% indefinitely. Assuming a discount rate of 12%, what is the current price of AA Co.?
What is the probability that none of the three parents condones spanking as a regular form of punishment for their children? Give the mean and standard deviation of x. Interpret the results.
The weight of corn chips dispensed into a 12-ounce bag by the dispensing machine has been identified as possessing a normal distribution with a mean.
Round 4 decimal places or give answers in scientific notation if necessary. 1. It is believed to be true that 15% of the U.S. population is left-handed. You randomly select 10 people. Let x represent the number of left-handers.
How do you know if a value is a solution for an inequality? How is this different from determining if a value is a solution to an equation?
a random variable x has a probability density function fx 2x for 0 lt x lt 1.find the difference between 10th
Computer software reports x‾ = 15.3 and P = 0.074 for a t test of H0: μ = 0 versus Ha: μ ≠ 0. Based on prior knowledge, you can justify testing the alternative Ha: μ > 0. What is the P-value for your significance test?
Create a 90% confidence interval for the level of cheating among high school students. Don t forget to check the appropriate conditions.
What must be performed to determine the significant group comparisons in an ANOVA?
Suppose that the heights of adult women in the United States are normally distributed with a mean of 63.5 inches and a standard deviation of 2.4 inches.
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