Roy is 4 years old and in the 69th percentile for neight in his age group. Vhat does this mean? Roy is shorter than 69% of 4 year olds.

Q: The 95th percentile of 6-year-old boys' heights in the United States is 48.8 inches tall.  Explain…

A: Given: The 95th percentile of 6-year-old boys' heights in the United States is 48.8 inches tall.

Q: Psoriasis is a skin disorder with no known cure and no proven effective pharmacological treatment.…

A: The provided information is as follows:The box plot of PASI scores, both before ( baseline ) and…

Q: Class Interval 0-9 10 - 19 20-29 30-39 40 - 49 64857 n = <CF

A: Given data is Class Frequency(fi) 0 - 9 6 10 - 19 4 20 - 29 8 30 - 39 5 40 - 49 7

Q: Helga scored in the 70th percentile rank on an exam. If 300 students took the exam, how many…

A: Given: percentile rank of Helga: 70th           total number of students who took exam: 300 students…

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

A:

Q: What percentage of scores would be above 567?

A:

Q: On a reading examination given to 900 students, Elaine’s score of 602 was higher than the scores of…

A: Solution

Q: After six biology tests, Ruben has a mean score of 76. What score does Ruben need on the next test…

A: After 6 biology tests :  Mean = 76  After next test : ( biology test will be 7 now )  Mean =78…

Q: Howard scored in the 55th percentile rank on an exam. If 400 students took the exam, how many…

A: Note:Hi there! Thank you for posting the question. To avoid plagiarism issues, we have used the…

Q: The test score at the 25th percentile is 108. What is the test score at the 75th percentile?

A: Solution

Q: Marla scored 70% on her last unit exam in her statistics class. When Marla took the SAT exam, she…

A: solution:  The difference is that Marla’s exam in her statistics class was graded by percent of…

Q: What percentage of scores are between scores 75 and 89?

A: By emperical rule  P(-1&lt;Z&lt;1)= 0.68 P(-2&lt;Z&lt;2)=0.95 P(-3&lt;Z&lt;3)= 0.

Q: In a class of 10 students, James got 3rd position from the lowest. What is his percentile rank?

A: Given data: In a class of 10 students, James got 3rd position from the lowest. To find: What is his…

Q: The median is equal to the 5th decile. True or False?

A: Solution

Q: You took the English achievement test to obtain college credit in freshman English by examination.…

A: General definition of pth percentile: For whole numbers p(where 1&lt;p&lt;99) , the pth percentile…

Q: . The result of an English exam show a mean score of 55 and a standard deviation of 6. What percent…

A:

Q: on a 100 item test romel got a score of 88 which is the 9th decile what does it mean

A: Di = i * (n + 1)  10 th data

Q: Hurricane Damage Find the percentile rank for each value in the data set. The data represent the…

A: Given data  2.3,3.3,6.2,7.9,9.6,11.3 N =6

Q: 350 students took a standardized test, Sarah’s score was ranked at the 7th. What was the percentile…

A: that is (7×100)/350=700/350 =2

Q: In a city with three high schools, all the ninth graders took a Standardized Test, with these…

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Q: Empirical Rule Name Date 500 freshmen at Crescent High School took an algebra test. The scores were…

A:

Q: What percentage of the scores are in the shaded area?

A: It is given that the shaded area in graph.

Q: 28. Grade-point average. The grade-point averages of a random sample of 100 students from a…

A: Compute the value of the mean. The value of mean is obtained below as follows: From the information,…

Q: The following frequency distribution table is for 50 students who took a competency test. The data…

A: From the provided information, Test Scores Frequency 300-399 2 400-499 13…

Q: ter six biology tests, Ruben has a mean score of 73. What score does Ruben need on the next test to…

A: Given data,After six biology tests, Ruben has a mean score of 73Which means∑x6=73∑x=438What score…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.