A group of friends, on average, had $300 in their wallets, with a standard deviation of $50. Surprisingly, the distribution is normally distributed. The sneaky Chad said, “I am in the 88 th percentile of this group.” How much money does Chad have?

What would a histogram look like if the mean is 50 the median is 50 and the standard deviation is 1.6?

The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the chances that someone is earning more than $20 an hour?

When dating someone, what matters more to you: looks or personality? This question was the focus of a community college student’s class project for an introductory statistics course. She devised a 25-point scale. An answer of 1 means “personality matters most and looks don’t matter at all.” A score of 25 means “looks matter most and personality does not matter at all.” Her hypothesis is that the mean scores for males and females will differ, but she does not have an opinion about which population will have a higher mean score. Here are her hypotheses. H0: μ1 − μ2 = 0 Ha: μ1 − μ2 ≠ 0 She chose a random sample of 10 classes from the schedule at Los Medanos College and distributed surveys in those classes. Survey respondents totaled 170 students: 85 females and 85 males. We used her data to run a hypothesis test for a difference in two population means.  Here are the results: he results:   t df p Cohen's d Gender -4.11 168 0.0000 -0.629   Which conclusion is the most accurate…

QUESTION 8 According to BusinessWeek, 44% of advertisers claim they have been a victim of internet click fraud. If 120 advertisers are survey more of them will claim they have been a victim of internet click fraud, a. None of the answers is correct Ob.0.8310 OC. 0.6293 d. 0.3707 e.0.1690 QUESTION 9 Assume the cost for an automobile repair is normally distributed with a mean of $524 and a standard deviation of $149. If the cost lower 7% of automobile repair charges, what is your cost? Click Save and Submit to save and submit. Click Save All Answers to save all answers. MacBook Air 20 F3 D00 F4 F2 F5 $ & 1 4 Q W R T Y #

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%

One hundred teachers attended a seminar on mathematical problem solving. The attitudes of twelve of the teachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher's attitude toward math became more positive. The 12 change scores are as follows: 3; 8; -1; 1; 0; 4; -3; 2; -1; 5; 4; -2 what is the standard deviation for this sample? what is the median change score? find the change score that is 2.2 standard deviations below the mean.

Cherise is interested in how her friends compare to the population for number of hours of television watched during a single week. She collects the data from 9 of her friends. The average for her friends is 28 hours, with a standard deviation of 9. She knows that the population mean is 34. What is the t statistic?

In a survey, 80% of the voters support a particular referendum.  If 30 voters are chosen, find the standard deviation of the number of voters who support the referendum.

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.