Below is a graph of a normal distribution with mean u=4 and standard deviation o = 2. The this distribution that is less than 3. 0.4+ 0.3 0.2

Q: A normal distribution has u = 30 and o = 5.

A: Given that, Mean = 30 Standard deviation = 5 Z score = 1.3

Q: Assume that the scores of a college entry exam are normally distributed with a mean of 400 and a…

A: Given,mean(μ)=400standard deviation(σ)=60

Q: A normal distribution has a mean of 140 and a standard deviation of 3. Find the z-score for a data…

A: The objective of this question is to calculate the z-score for a data value of 142 in a normal…

Q: The lifetime of a certain type of t.v tube has a normal distribution with a mean of 80.0 and a…

A: Given Data: Let X represent the random variable   Mean=80 SD=6   X~ Normal (80, 62)

Q: What is the z-score for an exam mark of 80

A: Given that μ = 71 and σ = 6 And we have to find the z score for an exam mark of 80.

Q: Find z so that 90% of the standard normal curve is between -z and z.  Choose the closest answer.

A: Solution: Let

Q: Let X follow a normal distribution with mean 5.3 and unknown standard deviation. If P(X < 11.6) =…

A: From the given information, let X follows a normal distribution with mean of 5.3 and standard…

Q: A normal distribution has a mean of 93 and a standard deviation of 5. Find the z-score for a data…

A:

Q: The following figure is a normal curve that represents the approximate weights, in pounds, of adult…

A:

Q: What z-score is equal to z0.05? Draw a normal curve as part of your work.

A: Givenz0.05=

Q: Assume that adults have IQ scores that are normally distributed with μ=38 and a standard deviation…

A:

Q: Suppose that Xhas a normal distribution, Find E[ekx].

A: Solution

Q: For the standard normal curve, find the z-score that corresponds to the 7th decile

A: standard normal distribution Z~N(0,1) find z score correspond to 7th decile

Q: The lifetime of a 2‑volt non‑rechargeable battery in constant use has a Normal distribution, with a…

A: It is known that X is the lifetime of a 2‑volt non‑rechargeable battery with mean 516 hours and a…

Q: A normal distribution has a mean of u = 100 with 0 = 20. If one score is randomly selected from this…

A:

Q: You are conducting a study to see if the proportion of women over 40 who regularly have mammograms…

A: Given that  Test statistic z = -1.549

Q: What percentage of a normal distribution falls between z = -1.16 and z = +1.16?

A: Standardized z-score:   The standardized z-score represents the number of standard deviations the…

Q: The center of a normal curve is the mean of the distribution. O is the standard deviation. O cannot…

A: Answer  The center of a normal curve is the mean of the distribution. It is a bell-shaped curve.…

Q: A normal distribution has a mean of 109 and a standard deviation of 4. Find the z-score for a data…

A: Let X be the random variable from normal distribution with mean (μ) = 109, standard deviation (σ) =…

Q: Let X be a variable with normal distribution with mean ? = 36.8 ℃ and standard deviation ? = 0.4 ℃.…

A: We want to find probability of temperature reaches more than 40° c

Q: A normal distribution has a mean of 130 and a standard deviation of 4. Fing the z-score for a data…

A: The mean is 130 and the standard deviation is 4.

Q: A normal distribution has a mean of 100 and a standard deviation of 7. Find the z-score for a data…

A: The mean is 100 and standard deviation is 7.

Q: A normal distribution has mean u = 56 and standard deviation o = 20. Find and interpret the z-score…

A: X follows a Normal distribution with mean = 56 and S.D = 20 Then z=(x-mean)/SD = (x-56)/20…

Q: Suppose that x has a normal distribution with mean ? = 50 and standard deviation ? = 5. Find P(x >…

A:

Q: A normal distribution has a mean of 150 and a standard deviation of 9. Find the z-score for a data…

A: Suppose the variable of interest is x.The random variable x follows normal distribution with mean…

Q: The standard normal distribution has a mean of 0 and a standard deviation of 1. Find the z-score for…

A:

Q: A normal distribution has a mean of 77 and a standard deviation of 6. Find the z-score for a data…

A: From the provided information, Mean (µ) = 77 Standard deviation (σ) = 6 X~N (77, 6)

Q: The variable xx denotes the time taken in seconds for a computer link to be made between the…

A:

Q: Assume that X, the starting salary offer for anthropology majors, is normally distributed with a…

A: First, we need to calculate the Z-scores for the given salary amounts. The Z-score is a measure of…

Q: A normal distribution has a mean of 125 and a standard deviation of 3. Find the z-score for a data…

A: A normal distribution has a mean of 125 and a standard deviation of 3. mu

Q: The variable xx denotes the time taken in seconds for a computer link to be made between the…

A: It is given that the mean is 15 and the standard deviation is 3.

Q: For the standard normal curve, identify the z-score that corresponds to the 20thpercentile.

A: The z-value corresponding to 80% or an area of 0.80 is 0.8416 as per z-table.

Q: A normal distribution has a mean of 103 and a standard deviation of 7. Find the z-score for a data…

A: Given: μ =103 &amp; σ=7 the z-score corresponding to 100 is   Z=100-μσ =100-1037= - 0.43

Q: Suppose that x is normally distributed with a mean of 20 and a standard deviation of 15. What is P(x…

A: given data, normal distribution, μ=20σ=15p(X≥55.40)=?

Q: A normal distribution has a mean of 144 and a standard deviation of 8. Find the z-score for a data…

A: Given that, μ=144, σ=8 We know that, z-score is given as, Z=X-μσ

Q: the mean is 146, and standard deviation is 35. A score of 181 is how many z-scores above the mean?

A:

Q: The standard normal distribution has a mean of 0 and a standard deviation of 1. Find the z-score for…

A: