X is a normally distributed variable with mean = 60 %3D and standard deviation = 10 %3D For a randomly selected score from this distribution what is the probability that X is less than 42

Q: A normal distribution has a mean of μ= 54 and a standard deviation of σ=6 What is the probability of…

A: From a normal distribution, Mean = 54 Standard deviation = 6

Q: Suppose the distribution of serum cholesterol values in undergraduate men is approximately Normally…

A: GivenMean(μ)=190standard deviation(σ)=40

Q: The random variable X has a uniform distribution with values between 11 and 21. What is the mean…

A:

Q: About 78​% of all female heart transplant patients will survive for at least 3 years. Ninety female…

A: Given information- Population proportion, p = 0.78 Sample size, n = 90 The sample proportion is- We…

Q: find the 80th percentile of a normal distribution where x=n(50,10)

A: Step 1:Find the 80th percentile of a normal distribution.X∼N(50,10)=X∼N(μ,σ)Step 2:Find the Z-score…

Q: The score obtained by 800 students in a statistics examination are approximately normally…

A: Given: n=800, μ=78 and σ=7.   The z-score is calculated asz=x-μσ=80-787=0.29

Q: The scores on a standardized test are normally distributed with a mean of 105 and standard deviation…

A: Let k is 0.6 standard deviation below the mean.  That means -0.6 is the z score of the value.…

Q: The scores on a standardized test are normally distributed with a mean of 90 and standard deviation…

A: The test score is 0.6 standard deviations above the mean is obtained below: From the given…

Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…

A:

Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…

A: Standard normal distribution:The standard normal distribution is a special case of normal…

Q: he scores on a standardized test are normally distributed with a mean of 120 and standard deviation…

A:

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

A:

Q: A sample of final exam scores is normally distributed with a mean equal to 20 and a variance equal…

A: Given that a sample of final exam scores is normally distributed with mean, and variance, .