In a class of 30 students, 29 of them took an exam in class and 1 student took a make-up exam the following day. The professor graded the first batch of 29 exams and found an average score of 75 points with a standard deviation of 5.9 points. The student who took the make-up the following day scored 60 points on the exam. To find the new average I added 75 to 60 then divided by 2 to get 67.5 and the question says to round two decimal places so I made it 68 and I got it incorrect.

Q: Find the standard deviation of this number set: {2, 4, 9} showing all of the steps involved as shown…

A:

Q: tudent obtained the mean of 58 observations as 48. It was later found that one observation was…

A: Given data, n=58 The mean for 58 observations is 48 x=∑xn48=∑x58∑x=2784

Q: The mean and standard deviation of players' heights for the 2003 NBA season were H 79.5 inches and o…

A: A z-score (also called a normal score) gives an indication of how far from the mean a data point is.

Q: Todd just got back his exam grades in three classes. In biology the class mean was 75.80 with a…

A: Consider X as the random obtained score in Biology, Political Science or Economics. For comparing…

Q: The mean grade on a science test was 79 and there was a standard deviation of 6. If your sister…

A: The z score explains the deviations of the observations from the mean. It is calculated using the…

Q: The mean and S.D. of income of 50 men are Rs. 3200 and Rs. 525 respectively The same for 40 women…

A: Formula for S.D for combined group: σ12=n1(σ12+d12)+n2(σ22+d22)n1+n2          Combined mean is,…

Q: The mean grade on a science test was 79 and there was a standard deviation of 6. If your sister…

A: We have given that,  Let X be the random variable from normal distribution with mean (μ)= 79,…

Q: On five exams, Rachel has a mean score of 80 points. Her lowest score was 50.  If this score is…

A:

Q: The mean score on a set of 25 tests is 74. Suppose two more students take the test and score 68 and…

A:

Q: The mean grade of adrian in the final examination in mathematics was 85 and the standard deviation…

A: The mean of a dataset is computed by μ=∑xn, where ∑x is sum of observations and n is the total…

Q: On a nationwide math test, the mean was 52 and the standard deviation was 4. If Roberto scored 85,…

A: The z score formula is,

Q: D8 A 1 SUMMARY OUTPUT 2 3 4 Multiple R 5 R Square 6 Adjusted R Square 7 Standard Error 8…

A: Given the output and ANOVA table for a linear model we have to solve for the test statistic and make…

Q: The mean of 14 numbers is 49. Removing one of the numbers causes the mean to decrease to 43. What…

A: given data:mean =49n=14 Removing one of the numbers causes the mean to decrease to 43new total…

Q: Dr. Smith administered a test to her statistic class with 25 questions that were worth one point…

A: If n is multiplied by each observation, the new value for mean is, E(n×X) = nE(X) If n is multiplied…

Q: On a final exam, the mean mark was 68% and the standard deviation was 12%. If John’s mark was 36%…

A: Given that on a final exam, the mean mark was 68% and the standard deviation was 12%. If John’s mark…

Q: The mean of 200 items was 50. Later on it was found that two items were wrongly taken as 92 and 8…

A:

Q: Sarah​'sscore on the Stats midterm was 81 points. The class average was 76 and the standard…

A: Given that  Mean = 76 SD = 5 And the Sarah's score is X = 81

Q: What is the p value if the mean is 98.6, n=7, t= -2.114?

A: The P-value is the probability that provides strong evidence in favor of the alternative hypothesis.…

Q: The mean score of 10 students of an algebra class was 85. When two new students enrolled, the mean…

A:

Q: Roy is 4 years old and in the 69th percentile for neight in his age group. Vhat does this mean? Roy…

A: The percentile is used to measure the location of a data set.

Q: aking the Graduate Management Aptitude Test averaged 812 with a standard deviation of 145. Only…

A: Given: Meanμ=812Standard deviationσ=145 Consider, X be the random variable that shows the average…

Q: 5 points on his st. The mean was 70 standard deviation atively better on thein

A:

Q: For 120 consecutive days, a process engineer has measured the temperature of champagne bottles as…

A: Given, that the process engineer measured the temperature of champagne bottles for  consecutive…

Q: am has 20 rose bushes. the number of flowers on each bush is 9, 2, 5, 4, 12, 7, 8, 11, 9, 3, 7, 4,…

A: Given data, 9, 2, 5, 4, 12, 7, 8, 11, 9, 3, 7, 4, 12, 5, 4, 10, 9 , 6, 9, 4 Population standard…

Q: The distances golf balls travel under laboratory testing conditions are normally distributed. The…

A:

Q: A mathematics professor lost a test paper belonging to one of her students. She remembered that the…

A: The mean score for the class of 20 was 81. Thus, total number of her students was n=20.…

Q: The mean grade of Adrian in the final examination in mathematics was 85 and the standard deviation…

A: 1) Given that: Mean for mathematics = 85 Standard Deviation for mathematics = 7 Mean for science =…

Q: An incoming freshman took her college's placement test in French and she scored 82 points. The…

A: Given: μ=72σ=8x=82

Q: The mean grade of Adrian in the final examination in mathematics was 85 and the standard deviation…

A: For mathematics :mean(μ)=85standard deviation(σ)=7For sciencemean(μ)=89standard deviation(σ)=13

Q: The mean grade of  Adrian in the final examination in mathematics was 85 and the standard deviation…

A: Mean for mathematics = 85 Standard Deviation for mathematics = 7 Mean for science = 89 Standard…

Q: Todd just got back his exam grades in three classes. In biology the class mean was 75.80 with a…

A: Given that: Population mean score and standard deviation of biology class are μ=75.80 and σ=5.15.…

Q: The distances golf balls travel under laboratory testing conditions are normally distributed. The…

A: Given,mean(μ)=312P(X>319)=0.28

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.