A test consists of 980 true or false questions. If the student guesses on each question, what is the standard deviation of the number of corect answers? Round the answer to the nearest hundredth. OA. 2.00 O B. 22.14 OC. 15 65 O D. 000

Q: A biologist found the wingspans of a group of monary butterflies to be normally distributed with a…

A: X follows a Normal distribution with mean = 51.6 and S.D = 2.5 Then z=(x-mean)/SD = (x-51.6)/2.5…

Q: A biologist found the wingspans of a group of monary butterflies to be normally distributed with a…

A:

Q: Both sets of values have an average of 13. Is Set A's standard deviation smaller, larger, or about…

A: Given : Set A: 1 2 3 23 24 25 Set B: 9 10 11 14 16 18 Both sets of values have an average of 13

Q: A set of data is normally distributed with a mean of 327327 and a standard deviation of 27.27. What…

A:

Q: The height of an adult male is known to be normally distributed with of mean of 69 inches and a…

A:

Q: A quiz consists of 20 true or false questions. If the student guesses on each question what is the…

A: Solution: Let X be the number of correct answers and n be the number of questions. Since the…

Q: There are 15 numbers on a list, and the mean is 25. The smallest number on the list is changed from…

A: The numbers in the list is 15, the mean is 25 and the smallest number is changed from 12.9 to 1.29.

Q: Answer the following questions given that the mean weekly quiz score for a class is 72 with a…

A: Given data,Mean μ=72sd     σ=8P(70<X<90)=?

Q: A parent is hopeful that their son will score in the top 15% of a. dance competition. What score…

A: We have given that, The mean of the distribution is 28 and the standard deviation is 6.   Z-score =…

Q: A survey of 1000 men ages 20 to 30 found that their heights were normally distributed, with a mean…

A: Solution: Let X be the height of men ages 20 to 30. From the given information, X follows normal…

Q: An engineer claims that the average weights of their products is 750 grams with population standare…

A: As per guideline only First question to be attempted. please repost thhe other questions. Step 1…

Q: A data set has a mean of 60.4 and a standard deviation of 5.2    Is a value of 45 unusual? Is a…

A: From the provided information, Mean (µ) = 60.4 Standard deviation (σ) = 5.2 X~N (60.4, 5.2)

Q: The probability that an individual is left handed is 0.15 in a class of 60 students. What is the…

A: Given data: The given probability is p=0.15. The numbers of students are n=60. The expression for…

Q: A biologist found the wingspans of a group of monary butterflies to be normally distributed with a…

A:

Q: Seth asked a random sample of 20 students how much cash they had in their pocket. The following…

A:

Q: Both sets of value have an average of 13. Is set A's standard deviation smaller, larger, or about…

A: The average is the ratio of addition of all observations and total number of observations. The…

Q: The standard deviation of a variable is 15. If a sample of 100 individuals is selected, what size is…

A:

Q: The mean weight of a group of boys is 145 lbs, with a standard deviation of 4 lbs. If the weights…

A:

Q: A biologist found the wingspans of a group of monary butterflies to be normally distributed with a…

A: Given : Let, X = Wingspans of butterflies  X~N(μ=52.6,σ2=(2.9)2)  We want to find, (a)…

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 that the mean weight of senior high school students is 65kg with a standard deviation of 10kg.…

A:

Q: Both sets of values have an average of 13. Is Set A's standard deviation smaller, larger, or about…

A: The average of both the data sets is provided as 13. The deviations from mean for data set A; 1 –…

Q: (g) How many of these flights would you except to be on time? (h) What is the standard deviation?

A: The binomial distribution is a discrete probability distribution where the probability of x…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 260 days…

A: From the provided information, Mean (µ) = 260 days Standard deviation (σ) = 16 days X~N (260, 16)

Q: According to geologists, the San Francisco Bay Area experiences six earthquakes with a magnitude of…

A: Six earthquake every 100 years

Q: If a researcher devises a test of emotional intelligence with a mean of 50 and a standard deviation…

A: We want to find the probability  P(40<X<50)

Q: The scores on a psychology exam were normally distributed with a mean 56 of  and a standard…

A:

Q: A biologist found the wingspans of a group of monary butterflies to be normally distributed with a…

A:

Q: "The weights of 1,000 children, in average, is 53kg with standard deviation of 11kg. Suppose the…

A:

Q: The scores on an economics examination are normally distributed with a mean of 72 and a standard…

A: From the provided information, Mean (µ) = 72 Standard deviation (σ) = 16 Let X be a random variable…

Q: The mean weight of a group of boys is 175 lb, with a standard deviation of 12 lb. If the weights are…

A: The mean weight of a group of boys is 175 lb, with a standard deviation of 12 lb. If the weights are…

Q: Both sets of values have an average of 13. Is Set A's standard deviation smaller, larger, or about…

A: The data are given for sets A and B standard deviation can be calculating by using formula,…

Q: Suppose babies born in a large hospital have a mean weight of 3181 grams, and a standard deviation…

A: Given,   Mean = 3181 Standard deviation = 526   The objective is to find the probability that the…

Q: Suppose that the annual rainfall in Ferndale, California, is known to be normally distributed, with…

A: We have given that  X~N( mu , sigma^2) mu=35.5  ,sigma = 2.5 Z-socre =(x-mu)/sigma

Q: A biologist found the wingspans of a group of monary butterflies to be normally distributed with a…

A: Solution: a. Let X be the wingspans of a group of monary butterflies. From the given information, X…

Q: A test consists of 260 true or false questions. If the student guesses on each question, what is the…

A: Binomial distribution: A discrete r.v. X taking values 0,1,2,3, …., n is said to follow a binomial…

Q: stributed with a mean of 100 and a standard deviation of 16. Find the proportion of people in the…

A:

Q: The mean IQ score for 1800 students is 90, with a standard deviation of 10. Assuming the scores have…

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Q: A test consists of 90 multiple choice questions, each with five possible answers, only one of which…

A: Binomial distribution: A discrete r.v. X taking values 0,1,2,3, …., n is said to follow a binomial…

Q: (c) If the storeroom has 30 reams at the start of the day, how many should the manager expect to…

A: Given: X 0 1 2 3 4 5 P(X=x) 0.05 0.15 0.25 0.4 0.05 0.1

Q: A quiz consists of 40 multiple choice​ questions, each with five possible​ answers, only one of…

A: The number of multiple choice​ questions is, n = 40 The probability of getting correct answer is, p…

Q: A quiz consists of 50 multiple choice questions, each with five possible answers, only one of which…

A: Given ,n = 50 P = 15 = 0.2

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

A: GivenMean(μ)=50standard deviation(σ)=8z=2.50

Q: A particular fruit's weights are normally disturbed, with a mean of 415 grams and a standard…

A: Give your answer to the nearest gram. From the given information, Consider, X is a random Variable…

Q: The average weight of dogs that come to a certain vet's office is 55.6 pounds, with a standard…

A: Solution-: Given: μ=55.6,σ=2.2 We find, P[dog weight more than 60 pounds]=?

Q: The standard deviation of a variable is 15. If a sample of 100 individuals is selected, what size…

A: The standard error of mean is, SE = σ/√n, where σ is the standard deviation and n is the sample…

Q: The average score on a test of 40 students has a mean score of 53 and a standard deviation of 6. At…

A: Answer - The average score on a test of n = 40 Student has a mean score μ = 53  and σ = 6…

Q: The selling price of a new car is normally distributed with an average of $19110 and a standard…

A: Let X denotes a selling price of a new car. Here, X follows normal distribution with mean value of…

Q: Sixteen percent of the world's population is left-handed. A researcher claims that left-handed…

A: a) mean (p) = 0.16 , q = 1 - 0.16 = 0.84 , n =2100

Q: On a multiple choice test with 43 questions, each question has five possible answers, one of which…

A: The probability any randomly selected question will be correct will be: p=15   Consider X be the…