In a statistics class of 150 students, the mean and standard deviation of scores was 70 and 5, respectively. Use the empirical rule to determine the number of students who scored more than 75. Select one: a About 24 b. About 64 O CAbout 68 d. About 32

Q: For a population that has a standard deviation of 10, figure the standard deviation of the…

A: Given that  Population standard deviation =10 Then we have to find the standard deviation of the…

Q: On a standard measure of hearing ability, the mean is 300 and the standard deviation is 20. Give the…

A: Given data ,Mean u=300S.D σ=20

Q: Assume that scores on a trivia challenge test were distributed normally, with an average score of 70…

A: Given data, μ=70σ=6

Q: The mean is u: = and the standard deviation is o: =

A: Given,

Q: In a departamental examination in  statistics given to 500 students, the mean score was 75 with a…

A: A z score tells us where score is lies on normal distribution curve. if z score is is zero is it…

Q: Find the​ z-score for the value 87​, when the mean is 82 and the standard deviation is 8. A. z=−0.96…

A: Given,mean(μ)=82standard deviation(σ)=8and the value(x)=87

Q: For a set of data that are distributed in a bell or mound shape, approximately what percentage of…

A: In particular, the empirical rule predicts that 68% of observations falls within the first standard…

Q: A sample was done, collecting the data below. Calculate the standard deviation, to one decimal…

A: The value of sample mean is,

Q: What is the minimum percentage of data values that will come within 3.5 standard deviations from the…

A: Here, standard deviation = k = 3.5

Q: Find the following z-scores when the mean is 25 and the standard deviation is 4: a) 20 b) 32 c) 28…

A: It is given that Mean = 25, SD = 4 The z score is is defined as Z = (X - mean)/SD

Q: In my homework assignment, I have a concern about standard deviation do I have to round it to two…

A: Rounding-off must always be done as per the instruction in the  question. In the absence of an…

Q: e a sample of 25 hamburgers and weigh them, we find that the mean is 0.57 pounds and the standard…

A: Given that  (a) sample size (n) =25     Sample mean (x¯) = 0.57 pounds     Standard deviation (s)…

Q: (a) Determine the mean and the standard deviation for each data set.

A:

Q: For a population that has a standard deviation of 10​, figure the standard deviation of the…

A:

Q: Given that the mean of a data set is 20, and the standard deviation of this data set is 8, then what…

A: Solution : Given : μ = 20             σ = 8             X = 40 The value of Z-score can be computed…

Q: c) For the normal distribution of burning times of electric light bulbs, with a mean equal to 1200…

A: Since you have posted multiple subparts , we will solve first three subparts  for you. To get the…

Q: In a Science test, the mean score is 42 and the standard deviation is 5. Assuming the scores are…

A: As per bartleby guidelines only 3 subparts are answered please upload the rest separately. The mean…

Q: The annual commissilons per salesperson employed by a retailer of mobile communication devices…

A: Let X be the random variable from normal distribution with mean (μ) = $ 41200 ans standard deviation…

Q: For a population with mean of 50 and standard deviation of 8, what is the raw score that corresponds…

A: Given,mean(μ)=50standard deviation(σ)=8

Q: Given the data 18, 23, 26, 29, find the standard deviation to two decimal places answer rounded to…

A:

Q: The following data show the weights (in pounds) of 20 students in a class. Find the standard…

A: Given that data The weights of 20 students in a class. Number of data values (n) = 20 Sum of all…

Q: For a mean of 70 and a standard deviation of 8, find standardized score for a value of 80. O - 1.25…

A: From the provided information, Mean (µ) = 70 Standard deviation (σ) = 8

Q: On a standardized test with a normal distribution, the me was 64.3 and the standard deviation was…

A: We have given that  The scores follow the normal distribution with mean 64.3 and standard deviation…

Q: "The weights of 1,000 children, in average, is 64kg with standard deviation of 18kg. Suppose the…

A: Given that n=1000, mu =64 ,s.d =18 ,p(x<59 ) =?

Q: Test Score Frequency 90 80 4 70 60 6 50 3

A:

Q: A pharmacologist measured the concentration of dopamine in the brains of several rats.The mean…

A: Mean = 1269 Standard deviation = 145

Q: An instructor in a large lecture class found, at the end of the semester, that the total point…

A: Given Data: Let X represent the total point distribution   Mean=530 Standard deviation=80   X~…

Q: A group of students take a Statistics Exam where the average was M = 90 and the standard deviation…

A:

Q: 4. Compute the average deviation on the data below Test scores X-Х bar Xi 57 60 65 70 78 s0 82 85…

A: 4. Formula for Average deviation is, Average deviation=∑x'n Where x'=x-x¯ x¯=∑xin  , n=10…

Q: On a measure of artistic ability, the men for college students in new zealand is 150 and tthe…

A: Given mean = 150Standard deviation = 25The Z score is calculated using the below mentioned formula…

Q: Click the score that is two standard deviations above the mean. IQ Test Scores 30 40 50 60 70 80 90…

A:

Q: The standard deviation of the given data is A. 1.4495 B. 1.4597 C. 2.1011 D. 2.1307

A:

Q: The following data are the distances between 20 retail stores and a large distribution center. The…

A: Given data, 29; 30; 34; 40; 58; 67; 68; 69; 76; 86; 87; 95; 96; 96; 99; 106; 112; 127; 145; 150…

Q: Find the standard deviation of the set of data below. y+1, y+2, y+5, y+9, y+8.

A:

Q: Q2/ The number of hours worked by 10 employees of small building firm during a week were: 45 46 34…

A: Given data, 45,46,34,47,44,42,46,42,43,44

Q: If a student scored 77 points on a test where the mean score was 84.5 and the standard deviation was…

A: Solution: Let X be the score of a student. From the given information, X has a mean µ=84.5 and a…

Q: Find the following z scores with a mean of 25 and a standard deviation of 4. a. 20 b. 32 c. 28…

A:

Q: The following data are the distances between 20 retail stores and a large distribution center. The…

A:

Q: Suppose the heights of the members of a population follow a normal distribution. If the mean height…

A:

Q: The mean of a distribution is 50 and the standard deviation is 6. Using the empirical rule, find the…

A:

Q: The coefficient of variation for a data set is the mean divided by the standard deviation, expressed…

A: The provided statement is "False".

Q: Determine the point estimate, p and the sample standard deviation, S5.

A: here n = 439 x= 162 here x= no of students working full time while going to school

Q: Given this data determine a) the mean customer rating and b) the standard deviation for the customer…

A: We have to calculate the mean and SD for the given frequency distribution of customer ratings.

Q: Given that the mean of a set of data is 25 and the standard deviation is 3, what is the coefficient…

A: Given: Mean = 25 Standard deviation = 3

Q: For a population that has a standard deviation of 22​, figure the standard deviation of the…

A: Population standard deviation = 22 We know that standard deviation of the distribution of means = σn

Q: Use the fact that IQ score are normally-distributed with a meal of 100, standard deviation of 15 to…

A: Note: Hey, since there are multiple subparts are posted, we will answer first three subparts for…

Q: A test was given to 120 students, and the scores 8 approximated a normal distribution. If the mean…

A:

Q: Decide if each of the following statement is True or False. If all the scores in a data set are the…

A: If all the score in data set are the same,the standard deviation is equal to 1.00 False correct…

Q: Find the mean, standard deviation, and relative standard deviation for the set of measurements (7,…

A: Mean: The mean value is calculated as follows: The sum of the observations is divided by the number…