Suppose the full score for our final exam is 200 points. Based on previous record, we know students final exam score follows a normal distribution with mean 160 and standard deviation 15. Our class has 25 students. Find the probability that the class average score will be at least 165 is: 0.20 0.10 0.05 0.01

Q: In a college class, the average IQ is 115. Assume that the distribution is normal and that the…

A: In a college class, the average IQ is 115. Assume that the distribution is normal and that the…

Q: Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100 and standard…

Q: If the scores on a test have a mean of 26 and a standard deviation of 4, what is the z score for a…

A: We want to Z-score

Q: What is the probability that your score on an exam will be less than a 60, if the mean on the exam…

A: We have to find probability that your score on an exam will be less than a 60....

Q: A particular fruit's weights are normally distributed, with a mean of 522 grams and a standard…

A: GivenMean(μ)=522standard deviation(σ)=32sample size(n)=20

Q: The Intelligence Quotient (IQ) test scores for adults are normally distributed with a population…

A: Given that.   X~N( μ , ?^2 )   μ=100     , ?=25  , n=60   Z-score =( x - μ )/?

Q: The mean of a test is 400 and the standard deviation is 75. It is normally distributed. A sample of…

A: 1] Mean μ=400 2] standard deviation σ=75 3] n=25 4] μx¯=400σx¯=σn=7525=15

Q: It takes an average of 10.2 minutes for blood to begin clotting after an injury. An EMT wants to see…

A: From the provided information, The hypotheses are as follow: H0: µ = 10.2 H1: µ < 10.2 The test…

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: Mean of 200.  Standard deviation of 50. Probability that it is between 200 and 275.

A: Let the random variable X is approximately follows normal distribution with mean 200 and standard…

Q: The average age of senators in the 108th Congress was 58 years. If the standard deviation was 11…

A: Average or mean (μ) = 58 years and standard deviation (σ) = 11 years  Then, We will find the z…

Q: Assume that the total cholesterol levels for adults are normally distributed with mean cholesterol…

A: It is given that, Total cholesterol levels for adults are normally distributed with a mean…

Q: A population has a mean of u=50 and a standard deviation of 0=10. If 3 points were added to every…

A: The properties of mean are:E(X + a) = E( X ) + a * E(X+a)=E(X)+aE(aX)=aE(X)The property of variance…

Q: The entire student body of 225 students took a test. These test scores have a mean of 75, a standard…

A:

Q: Fifty students took a Mathematics exam. Assume that their scores formed a normal distribution with a…

A: Solution-: Given: μ=80,σ=4 We find x such that, P[X>x]=0.025