A class of 5 students averaged 70% on a given test. A class of 9 students averaged 80% on the same test. What would a class of 4 students have to average on the same test if the overall (weighted) mean was 74.33?

Q: Use the figure to the right, which shows the percentages of adults from several countries who favor…

A: Two sample z test for proportions: Two sample z test for proportions is the hypothesis test to test…

Q: Approximately 10% of students have a composite score below what level

A: If X is the composite score of the students, then we need to search for a x, such that P[X≤x]=0.1.

Q: We would like to know: "What percentage of college students read the college newspaper every day?"…

A: There are two ways to draw conclusion about a population.

Q: Which value is greater than at most 75% of all scores in a data set?

A: The median is middle value of the observations, above or below which 50% of the observations lie.

Q: Find the raw score for 99% with a population mean of 29 and σ of 4

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Q: One sample with n = 4 scores has a mean of M = 12, and a second sample with n = 6 scores has a mean…

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Q: If the Syracuse men's basketball team won 18 games and lost 10, and the Syracuse women's basketball…

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Q: (a) What percent of the scores are less than 19? (b) Out of 1500 randomly selected scores, about how…

A: mu = 19.9 s = 5.1

Q: A recent survey by the U.S. Census Bureau determined that the median monthly housing rent was $637.…

A:

Q: According to The Census Bureau, 60% of adults buy clothing online. a) How many adults did they…

A: Solution: a. From the given information, p=0.60 and E=0.03. The confidence level is 0.95.

Q: When 3,011 adults were surveyed in a Pew Research Center poll, 73% said that they use the internet.…

A: Given Information: n = 3011 ¾ of all adults use the internet (p)  = 75% = 0.75   = 73% = 0.73 Step…

Q: A bookstore found out that 23% of their customers buy a book, 34% of their customers buy two books,…

A: Given: Let X represents the number of books that customers buy. The random variable X can take…

Q: A recent survey by the U.S. Census Bureau determined that the median monthly housing rent was $631.…

A:

Q: ching basketball to football?

A: We have to use % formula to solve the problem

Q: A grocery store has determined that in crates of tomatoes, 95% carry no rotten tomatoes, 2% carry…

A: Given: The probability that crates carry no rotten tomatoes is 0.95. The probability that crates…

Q: A research report from an independent-measures study states that there are significant differences…

A: It is given that the numerator (treatments) degrees of freedom is 2 and the denominator (error)…

Q: What percentage of the sample were female drivers?

A: It is given that Total = 5+7+11+9 = 32 Number of females = 7+9 = 16

Q: Find the point estimate of the true proportion of people who wear hearing aids if, in a random…

A: It is an important part in statistics . It is widely used in all statistical procedures .

Q: One sample has n = 5 scores and M = 10. A second sample has n = 20 scores and M = 5. If the two…

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Q: What is the z-score corresponding to the 74th percentile

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: A recent study by the u.s. census bureau determined that the median monthly housing rent was $641.…

A: The median is middle value of the observations, above or below which 50% of the observations lie.…

Q: What percentage of pets are Rabbits?

A:

Q: Suppose that in a group of 800 women, the percentage who work is the same as in the sample here, how…

A: men women total work 15 23 80 not work 23 28 51 total 38 93 131

Q: If the mean number of people who attended six basketball games is 10230, what was the total…

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Q: $88,000

A:

Q: Find the weighted mean for a particular student's scores on three exams if the first one was worth…

A: The weighted mean can be calculated as: Weighted mean = Sum of (weightage x score) / Sum of…

Q: Three sections A, B, and C took the final exam in MATH. Section A with 30 students has a mean score…

A: The weighted mean is, x¯weighted=∑iwixi∑iwiwhere, wi=assigned weight to ith observarion…

Q: A politician is Interested in the proportion of voters in his district that think he is doing a good…

A: Given dataA politician is intrested in the proportion of voters in his district thet thinkhe us…

Q: In June, an investor purchased 3000 shares of Oracle (an information technology company) stock at…

A: Let, X be the share price of Oracle. X1=$53X2=$42X3=$45 Let, w be the number of shares.…

Q: How many scores are in the population?

A: here given, SS = 328 variance = σ2 = 8

Q: The US population is 13% African American.  If you were to take a SRS of 500 Americans, above what…

A: Solution:From the given information, the proportion of African American is 0.13, random sample of…

Q: percentages:

A:

Q: In a sample of size 20, the sample mean is 60. In this case, the sum of all observation in the…

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Q: If 40% of all the students are taking four classes, and 60% of all the students are taking three…

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Q: We would like to know: “What percentage of college students read the college newspaper every day?”…

A: We have to find given probabiity.

Q: In a 100- item test, the score of Student C is 1/2 SD above the mean. Mean is 50 and SD is 4.8. What…

A: 13. The mean is 50 and standard deviation is 4.8.

Q: If the mean number of people who attended four basketball games is 7380​, what was the total…

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Q: Use the figure to the right, which shows the percentages of adults from several countries who favor…

A: We have to test the claim that "the proportion of adults in Country C who favor building new nuclear…

Q: In the population, the mean SAT score is 1000. Would you be more likely (or equally likely) to get a…

A: Given that the population mean is 1,000 and the samples sizes selected are 10 and 30.

Q: A population with a mean of 8 has a sum of 40. How many scores are in the population?

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Q: If the proportion of Hs is .45 out of 200 flips, what is the p-value?

A: Solution-: Given : We find p-value=?

Q: In a sample of 20 men, the mean height was 178 cm. In a sample of 30 women, the mean height was 164…

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Q: C) Which of the following questions would the researcher not be able to explore using a 2 proportion…

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Q: In a survey that asked individuals about their favorite styles of music, 37 replied rock, 27 said…

A: Mode: Mode is the value, which has the highest frequency among all other values of the observation.

Q: What is the level of significance?

A: It is given that the sample size n is 15.

Q: class YES NO Undecided freshman 48 21 11 sophomore 34 52 What proportion of those surveyed were…

A:

Q: 5. Given an example where you measured the height of 10 of your classmates and computed a mean of 70…

A: Note:Hey there! Thank you for posting the question. Since population mean is not given, we are…

Q: The mean weight of 15 wrestlers is 110 kgs. The mean weight of 5 of them is 100 kgs and another 5 is…

A: Given that, the mean weight of 15 wrestlers is 110 kgs. The mean weight of 5 of them is 100 kgs and…

Q: What proportion of the statistics students in this class are sophomores? 19 0.202 0.302 0.105

A: