Assume that the mathematical scores on the standardized test are normally distributed with a mean of 1500 and a standard deviation of 100. 1. What percent of students who took the test have a score above 1276? 2. What percent of students who took the test have a score below 1456? 3. What percent of students who took the test have a score in between 1300 and 1400?

Q: You calculate that the standard deviation of a set of observation is 0. This tells you that.....?

A: The standard deviation measures the deviation of data points from mean. Its formula involves the sum…

Q: The average time to travel to work for a person living and working in Grand Rapids is 17 minutes.…

A:

Q: The average travel time to work for a person living and working in Kokomo, Indiana is 17 minutes. I…

A:

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

A:

Q: .Suppose a population is known to be normally distributed with a mean, u, equal to 144 and a…

A: Given data,μ=144σ=27P(90<144)=?

Q: 1. Suppose that the mean of A is 360 and the standard deviation of A is 40. The mean of B is 45 and…

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…

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: The time (X) to complete a standardized exam is approximately normal with a mean of 70 minutes and…

A:

Q: 3. In regard to the standard deviation you calculated on #2, what is one conclusion you can make…

A: You have asked only question 3. So, the answer is given for question 3 below in the next step.

Q: a. A student whose grade is 83 would be at the 19th percentile. b. A student whose grade is 90 would…

A: According to our guidelines, we can answer only three subparts, so please repost the rest parts.

Q: In a given school year, the ACT test mean score was 21 with a standard deviation of 4.9.  The same…

A:

Q: For a data set of the pulse rates for a sample of adult​ females, the lowest pulse rate is 31 beats…

A: We have given that x̅ = 77 s = 18.4

Q: Given that a set of scores have a normal distribution, a mean of 74, and a standard deviation of 5:…

A:

Q: Given the figure above is a normal curve, with a mean score of 100 and a standard deviation of 15, a…

A: Given that ; Mean (μ) = 100 ? = 15  The given curve follows standard normal distribution by using…

Q: In​ 2007, the mean rate of violent crime​ (per 100,000​ people) for 10 regions in the northeast of a…

A: Solution: Let X be the violent crime rate. From the given information, X follows normal distribution…

Q: Given that a data set has a mean of  40 and a standard deviation of 4, find the percent of data…

A: Since you have posted a question with multiple subparts, we will solve first three subparts for you.…

Q: USA Today reports that the average expenditure on Valentine's Day was expected to be %100.89 . Do…

A: Given: For males: n1 = 42 X1 = 137.96 σ1 = 32 For females: n2 = 37 X2 = 66.6 σ2 = 18 Formula Used:…

Q: What is the Z value for a value of X = 60?

A:

Q: use the following information for the question. The average travel time to work for a person living…

A: Let X denote the distribution of travel time and it follows normal distribution with mean of μ=17…

Q: The residents of two towns both have a mean income of $30,000. Town A has a standard deviation of…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: John wishes to estimate the population mean salary of college graduates who took a statistics course…

A: Solution: Note: Hello! As you have posted 2 different questions, we are answering the first question…

Q: Assume scores on an exam are normally distributed with a mean of 80 and a standard deviation of 5.…

A: It is given the mean and standard deviation are 80 and 5, respectively.

Q: Suppose The total daily carbohydrate intake and for all boys age 13 and 15 years old in the US is…

A: Let x be the daily carbohydrate intake for all boys age 13 and 15 years old in the US which follows…

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 scores of students on a standardized test are normally distributed with a mean of 300 and a…

A: X~N(μ=300, σ2=402) (A) P(220<X<380)= ?  (B) P(X<260)= ? (C) P(X>a)=0.25 a= ?  Note: This…

Q: The mean grade on a final examination was 72 and the standard deviation was 9. The top 10% of the…

A: Mean(µ) = 72Standard deviations (σ) = 9

Q: Given the mean is 100, the standard deviation is 20, and 12 people took the test, which person…

A: We have given that Sample size=n=12 Mean=mu=100  Standard deviation=sigma=20

Q: What was the cutoff for a failing score? Approximately what percentage of the students failed?

A: The scores on a psychology exam were normally distributed with a mean of 68 and a standard deviation…

Q: Suppose the test scores of 600 students are normally distributed with a mean of 76 and standard…

A:

Q: Assume that Math test scores are normally distributed with a mean of 200 and a standard deviation of…

A: The provided information is  The mean and standard deviation is  µ=200 σ=40 P(X<120)=?…

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

A: The mean is μ=42 and the standard deviation is σ=5 so it follows:…

Q: Use the following information to answer the question. The mean age of lead actresses from the top…

A: Given that, μ=29.6 yearsσ= 6.35 years Let X denote the distribution of the actresses ages is…

Q: Assume a test in biology is normally distributed with a mean of 80 and a standard deviation of 5.…

A:

Q: 3. The heart rate for a group of patients at a local hospital is normally distributed with a mean of…

A: Given that mu = 97,s.d=18

Q: Suppose that the flying hours for aircraft operated by regional airlines in the U.S. during 2006 are…

A: Given Information Mean µ = 2500 Standard deviation(σ) = 400 P (Z > z) = 0.975 P(Z<z) = 1 –…

Q: Assume Springfield house prices are Normally distributed with a mean of $415,000 and standard…

A:

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 116 and a standard…

A: The empirical rule says that for normal distribution, 68%, 95%, and 99.7% of the values lie within…

Q: Assume that the SAT test scores are normally distributed with a mean score of 1200 and a…

A:

Q: For a data set of the pulse rates for a sample of adult females, the lowest pulse rate is 33 beats…

A: The question is about std. normal distribution Given : Lowest pulse rate ( x ) = 33 beats per minute…

Q: John wishes to estimate the population standard deviation of salary of college graduates who took a…

A: Standard deviation is the positive square root of the mean of the squared deviations of given…

Q: A distribution of exam scores has a mean of u=80. If your score is X=72, which standard deviation…

A:

Q: The mean of fifty sales receipts is $65.75 and the standard deviation is $10.55. Using Chebyshev’s…

A: Here, The mean of fifty sales receipts is $65.75 and the standard deviation is $10.55. Chebyshev’s…

Q: A distribution of numbers is approximately bell shaped. If the mean of the numbers is 129 and the…

A: a. The two numbers that would fall approximately between 68% of the given values are, Thus, the two…

Q: A distribution of exam scores has a mean of μ = 78. a. If your score is X = 70, which standard…

A: Given: μ=78 More the z score, better grades obtained from the standard deviation. a. The z score  is…

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A: From the provided information, Mean (µ) = 144 Standard deviation (σ) = 27 X~N (144, 27)

Q: Can you assist me in answering this? (this is not graded but, rather, an excersice conducive to…

A:

Q: On a measure of​ anxiety, the mean is 83 and the standard deviation is 12. What are the Z scores for…

A: Given: Mean (M) = 83 Stndard deviation (SD) = 12 Formula:

Q: 3. In the qualifying examination for the admittance to college, the mean score was 65 and the…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 116 and a standard…

A:

Q: In a given school year, the ACT test mean score was 21 with a standard deviation of 4.9. The same…

A: Z-score :  The z score measures the number of standard deviations that the values are from the mean…