11. A student answered 42 problems on a test correctly and received a grade of 84%. How many problems were on the test, if all the problems were worth the same number of points? *

Q: a. The proportion of Pennsylvanians with a high school diploma is equal to 0.83. b. The proportion…

A:

Q: What percentage of students are enrolled in between 12 and 18 credits?

A:

Q: In fall 2014, 34% of applicants with a Math SAT of 700 or more were admitted by a certain…

A: Let A be the event that student had Math SAT of 700 or more Therefore, PA=0.36 find The probability…

Q: Eight hundred student took a 90-point standardized examination. After the examination, the students…

A: Given information: Eight hundred student took a 90-point standardised examination Third quartile…

Q: 12. Jackson has scores of 80, 90, 83, and 81 on four Math quizzes. What is the score he needs on the…

A: Let us assume that the next score is x then

Q: 2. Is the severity of the drug problem in high school the same for boys and girls? 85 boys and 70…

A:

Q: A hot topic of debate is whether the legal driving age should be raised to eighteen. From a random…

A: It is tested whether majority of the Americans believe the legal driving age should be raised to 18.…

Q: 5. What percent of the sophomores watch TV for at least 15 minutes per night?

A: Following statistics is given for TV time   Minimum = 0 minutes Q1 = 15 minutes Q2 = 60 minutes Q3 =…

Q: In a survey at a health club, 208 members indicated that they enjoy aerobic exercises, 145 indicated…

A: Given that  In a survey at a health club, 208 members indicated that they enjoy aerobic exercises,…

Q: It is costly in both time and money to go to college. Does it pay off? According to the Bureau of…

A: The bar graph can be constructed using Excel as: Open MS Excel sheet Enter the data in first two…

Q: (a) What percentage of books last longer than 10 years? (b) What percentage of books last less than…

A: Given: The lifespan of all high school text book is approximately normal with μ=9 yearsσ=2.5 years

Q: 1) Is the amount of weight gained by rats who eat only junk food for four weeks ratio or interval…

A: Solution-: 1) Is the amount of weight gained by rats who eat only junk food for four weeks ratio or…

Q: One month is what percentage of a year, given that there are 7 days in a week, 4 weeks in a months…

A: One month is what percentage of a year,  given that there are 7 days in a week, 4 weeks in a months…

Q: 1) what proportion of students scored above student 33 on homework 3? 2) what proportion of students…

A: Given:   Student ID HW 1 HW 2 HW 3 1 98 93 99 2 81 80 64 3 66 91 75.5 4 84 94 80 5 65…

Q: A programmer plans to develop a new software system. In planning for the operating system that he…

A: Sample Size: The formula for the sample size is as follows: Here, zα/2 is the critical value at 99%…

Q: 36% of the children in a school have a dog, 24% have a cat, and 12% have a dog and a cat. What…

A: The percent of those who have a cat also have a dog is, PDog|Cat=PDog ∩…

Q: A population has a mean of μ = 40. If 5 points are added to each score, what is the value for the…

A: Let a population has n units,X1,X2,....,Xn.Then the total sum of the population is S=X1+X2+...+Xn.…

Q: In fall 2014, 36% of applicants with a Math SAT of 700 or more were admitted by a certain…

A:

Q: You survey 100 people and find that 75 of them would prefer to work at home to some extent. When…

A: Given: You survey 100 people and find that 75 of them would prefer to work at home to some extent.…

Q: 39. What is the value of (EX)² for the scores: -1, 0, 3, 5?

A: Given that  The data are -1,0,3,5 Find the value (∑X)2

Q: 4. A farmer estimated that there were 25 gallons of water left in a tank. If this is an…

A:

Q: vendor sells twenty-four sweatshirts for $15 each, fifty-one t-shirts for $10 each, and thirteen…

A:

Q: 13. Does the last column of percentages in the table add up to 100%?Check the researchers'…

A: 13. The last column of percentages is given as: % 20.6 5.9 12.4 18.3 14.4 11.1 9.5…

Q: 41. What is the value of EX + 1 for the scores: -1, 0, 2, 3?

A: Given data is -1,0,2,3

Q: 7) A researcher at a major hospital wishes to estimate the proportion of the adult population of the…

A: Given that, Critical value: Using the z-table, the critical value at 99% confidence level is

Q: Suppose that 35% of people own dogs. If you pick two people at random; what is the percent that they…

A: Solution: From the given information, the probability of people own dog is 0.35. Here, two people…

Q: Suppose that the results of a survey show that 46% of people consider summer as their favorite…

A: The following information is available in the question

Q: 2.) Suppose you scored 75, 64, and 79 on your first 3 math tests. a.) What is your current average?…

A: a) Average of 75,64 and 79: 75+64+793=2183=72.67

Q: 1. How many students have scored greater than or equal to 90 marks?              2. Find the number…

A: The height of the bars of the histogram describes the frequency of the corresponding class interval.…

Q: It is costly in both time and money to go to college. Does it pay off? According to the Bureau of…

A: Use barplot() command in R software to draw bar chart.

Q: Suppose that I want to estimate the percentage of students who  love statistics in California. How…

A: Given information- Margin of error, E = 3% = 0.03 Confidence level, c = 90% Since nothing is known…

Q: 7. What percentage suffered for fewer than 61 hours?

A: Given that.   X~N( μ , ?^2 )   μ=83     , ?=20   Z-score =( x - μ )/?

Q: A 2014 Pew Research Center Survey asked 2,002 adults about the intersection of politics and science.…

A: The provided information are:Number of trials (n) = 2002Number of successes (X) = 1281

Q: 1.) I want to estimate the proportion of adults who like sci-fi movies. How many people should I…

A:

Q: A student in a statistics class is going to select 5 of her classmates to ask a survey question. Of…

A: Given that: Total number of students = 19 Number of students live on campus = 8 Number of students…

Q: How large a sample is needed

A: Given :  Margin of error=E=3%=0.03 Significance level=α=0.01 The critical value is ,…

Q: (a) If you toss the coin 10 times, it will come up heads 5 times. (b) If you toss the coin a very…

A: Here use basic concept of expectation and MOE

Q: b. In a Pew Research Center poll on driving, 58% of the 1182 respondents said that they like to…

A: Step 1. (b) Total number of respondents is study =1182.

Q: How high must a vehicle's gas mileage be in order to fall in the top 15% of all vehicles?

A: Let X be the vehicle's mileage. Let μ and σ be the mean and standard deviation of all the vehicles.…

Q: In a Gallup poll of 1236 adult respondents, 6% said that bad luck follows breaking a mirror. That…

A: The margin of error expresses the amount of the random variation underlying a survey's results

Q: In fall 2014, 34% of applicants with a Math SAT of 700 or more were admitted by a certain…

A: All the given data is shown in the tree diagram

Q: In fall 2014, 38% of applicants with a Math SAT of 700 or more were admitted by a certain…

A: LetA - Percent math S A T score of less than 700 or more in all applicants.B – Percent math SAT…

Q: Suppose that the results of a survey show that 40% of people consider summer as their favorite…

A: Given Data: Let 'n' be sample size p^=0.4 Margin of error=0.04   Assuming level of significance to…

Q: Juanita read an average (mean) of 5 books a day for 4 days. How many books will Juanita need to read…

A:

Q: is costly in both time and money to go to college. Does it pay off? According to the Bureau of the…

A: The distribution table is given as under: Education Level Income 9th  24.6 HS 41.6…

Q: Rene scored at the 84th percentile on a test given to 12,600 students. How many students scored…

A: Given Rene scored at the 84th percentile a test given to 12,600 students.   How many students scored…

Q: 1. What percentage of batteries fail within the first 1541 hours of operation? 2. What percentage of…

A: Arrange the given data in an increasing order as shown below: 14 349 582 1278 2574 35 373 602…

Q: , (b) The sum of deviations of a certain number of observations measured from 4 is 72 and the sum of…

A:

Q: A teacher gives a 10-point test to a class of 10 children. Is there a way for 9 of the children to…

A: Given There are 10 children in class and teacher gives 10 point test. Assume that 9 students have…