A psychologist has designed a questionnaire to measure individuals' aggressiveness. Suppose that the scores on the questionnaire are normally distributed with a standard deviation of 80. Suppose also that exactly 15% of the scores exceed 750. Find the mean of the distribution of scores. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.

Find the mean and standard deviation for the individualized instruction scores. Scores Individualized Instruction 50 - 59 2 60 69 8. 70 - 79 9 80 - 89 11 90 99 9. Mean = %3D (Round to the nearest hundredth.)

Report the proportion you found in your physical sample as well as all the numbers you recorded from the virtual samples. Report anything you noticed about the way the graphs were shaped, how they were different as the sample size changed from 25 to 75 and how the means and standard deviations differed with the different sample size. Is a sample proportion more likely to be close to the population proportion with a larger sample size or with a smaller sample size?

Find the length that separates premature babies from those who are not premature.

Randy took a standardized test that is normally distributed. He scored a 105 on the test. The nationwide mean score on the test was 94 and the standard deviation was 6.2. What percent of the tested population scored higher than Randy on the test? Round to the nearest whole percent. O 2% 4% 96% O 94% 11%

Please be sure answers are correct.

The distribution of the scores on a standardized exam is approximately normal with mean 400 and standard deviation 35. Between what two values do the middle 50% of scores lie? Round to the nearest whole number. Write you answers with comma between them.

With the extra data value,  the range, standard deviation, and variance is?

The prices of all college textbooks follow a bell-shaped distribution with a mean of $108 and a standard deviation of $21. What percentage of the price that is more than 140? Show your works and read the table.

Help me please