It is determined that for a particular species of tree, the diameter of the trunk is best modeled with a normal distribution that has what percentage of trees of this type will have a diameter larger than 25 inches? Round your answer to the nearest tenth of a pe А. 63.1% В. 19.9% С. 36.9% D. 13.1%

Q: From a normal distribution with μ = 80 and σ = 8, what proportion of the curve lies at X ≥ 90?

A:

Q: Researchers at a National Weather Center in the north-eastern United States recorded the number of…

A: State the hypotheses. That is, there is no sufficient evidence to conclude that the past four years…

Q: In a county male height is normally distributed with a mean of 175 cm and a standard deviation of 6…

A:

Q: From a normal distribution with μ = 80 and σ = 8, what proportion of the curve lies at X ≤ 72?

A: For a normal distribution, Mean = 80 Standard deviation = 8

Q: Researchers at a weather center in the northeastern United States recorded the number of 90° days…

A: Solution: Given information: n= 4 Sample size μ=9.6 Population mean σ=1.9 Population standard…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 262 days…

A: Given information- Population mean, µ = 262 days Standard deviation, σ = 17 days Significance level,…

Q: Suppose that 35% of all adults in a population would say "good" and 65% would say "bad" if they were…

A: Given Data: p=0.35 n=1000

Q: i have already submitted the question for the first portion, I just need D and E answered, thank…

A: The random variable height follows normal distribution. We have to test whether the mean height of…

Q: In the past Algebra classes, records show that the average score of the students in the mid-term…

A:

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 268 days…

A:

Q: A certain machine makes electrical resistors having a mean resistance of 50 ohms and a standard…

A: Let, X= resistance Given that X follows a normal distribution with mean=50 and standard deviation=4…

Q: The heights of 500 students are normally distributed with a mean of 175.5 centimeters and a standard…

A: Givenmean(μ)=175.5standard deviation(σ)=6.5n=500

Q: Assuming a normal distribution, for a sample with M-40 and s=4, about 95% of the individuals will…

A: 32 and 48

Q: A normal distribution has a mean of µ = 40 with σ = 10. If a vertical line is drawn through the…

A: Given a normal distribution with mean = 40Standard deviation = 10The Z score for any data point X is…

Q: The psychology department is gradually changing its curriculum by increasing the number of online…

A: Given: Sample mean = 76, Population mean = 71, Population standard deviation = 12, Sample size = 36,…

Q: The mean weight of 500 male students at a certain college is 80 kg, and the standard deviation is 8…

A:

Q: The height of adult men in the United States is normally distributed with a mean of 70 inches and a…

A: Z = -0.67 Mu = 70 S = 3

Q: Suppose that 35% of all adults in a population would say “good” and 65% would say “bad” if they were…

A: It is given that a sample of 1,000 adults from a population is randomly selected and the population…

Q: A normal distribution has a mean of 60 and a standard deviation of 20. Barbara's score is 40. What…

A: It is given that the Normal distribution has a mean 60 and a standard deviation of 20.  Suppose X be…

Q: Given a normal distribution with μ=45 and σ=5​   For this​ distribution, 9​% of the values are…

A:

Q: A certain machine makes electrical resistors having a mean resistance of 40 ohms and a standard…

A: Let X be the normal random variable representing the resistance of an electrical resistors, is…

Q: A store sells meat in smallmedium and large size packages. The small packages have a mean weight of…

A: Here given that, Mean, mu= 1 And standard deviation, sigma= 0.1 Z score is given by, Z score=…

Q: question is in the picture

A: we want to test the hypothesis

Q: A bank loan officer rates applicants for credit. The ratings can be described by a normal model with…

A: Given: μ = ​200 σ = 50

Q: On one exam Mike had a score of 4, which corresponded to a z-score of z = -1.50, and Sandy had a…

A: The z-score formula is, z=x-μσ In the formula, x be the score, μ be the population mean, and σ be…

Q: A store sells meat in small, medium and large size packages . The small packages have a mean weight…

A: Given that small packages have a mean weight of 1 pound and a standard deviation of 0.1 pound. i.e.…

Q: A certain machine makes electrical resistors having a mean resistance of 50 ohms and a standard…

A: Percentage of resistor having exceeding resistanc 56 ohms =6.68%  # option(c) correct

Q: Past experience indicates that the standard deviation in the time it takes for a “fast lube”…

A:

Q: The average grade for an exam is 74, and the standard deviation is 7. If 12% of the class is given…

A: Let the random variable X denote grade score. Then, X~Nμ, σ2 with μ=74 and σ=7. Let α be the lowest…

Q: The distribution of weights for 12-month-old baby boys in the US is approximately normal with mean u…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

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

A: Assume random variable X denotes the lengths of pregnancies in a small rural village. It is given…

Q: The lengths of a large stock of titanium rods follow a normal distribution with a mean (u) of 440 mm…

A: Given that, The lengths of a large stock of titanium rods follow a normal distribution with a mean…

Q: Suppose a normal distribution has a mean of 50 and a standard deviation of 3. What is P(x≤ 47)? OA.…

A:

Q: The weights of a large number of miniature poodles are approximately normally distributed with a…

A: From the given information, let X be the number of weights of poodles. Here, X follows normal…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days…

A: The mean is 263 and the standard deviation is 14 days.

Q: The heights of river birch trees are normally distributed with a mean of 92.3 inches and a standard…

A: Given that the heights of a river birch trees are normally distributed with  mean of 92.3 inches and…

Q: A scientist found that the lengths of a certain population of snakes can be reasonably described…

A: The normal distribution  in the center is generally denser and basically less dense at tails. There…

Q: Oil field studies have shown that permeability measurements are having a normal distribution with a…

A: Let, X= permeability measurements  Given that X follows a normal distribution with mean 68 and…

Q: The manufacturer of an extended-life lightbulb claims the bulb has an average life of 13,000 hours…

A: Given Information: Mean Life (u) = 13000 hours Standard Deviation (s) = 1000 hours

Q: The shape of the distribution of the time required to get an oil change at a 15-minute oil-change…

A: a) Central Limit Theorem for mean: If a random sample of size n is taken from a population having…

Q: A shipment of eggs has a normal distribution with a mean height of 5.21cm and a standard deviation…

A: From the provided information, Mean (µ) = 5.21 cm Standard deviation (σ) = 0.15 cm X~N (5.21, 0.15)…

Q: The diameter of an electric cable is normally distributed, with a mean of 0.9 inch and a standard…

A: Given data: The given mean is xm=0.9 inch. The given standard deviation is σ=0.02 inch. The given…

Q: A normal distribution has a Mean of 25 and a S.D. of 10. Find the probability that the deviation…

A:

Q: When samples of size 25 are collected from a normal population that has a mean of 100 and a standard…

A: Given, n = 25 μ = 100σ = 20       To find, Sampling distribution of standard deviation?

Q: In a county male height is normally distributed with a mean of 177 cm and a standard deviation of 6…

A:

Q: The average grade for an exam is 74, and the standard deviation is 7. If 12% of the class is given…

A: Given: Average=74 Standard deviation=7 z value for 88th percentile z=1.18(consulting the table…

Q: A company responsible for making gumballs found that their gumballs had an average diameter of 2.21…

A: The given graph is the normalised distribution where mid line is the mean.  First left and right…

Q: Q2) A certain machine makes electrical resistors having a mean resistance of 60 ohms and a standard…

A: Given information: μ=60, σ=2

Q: Researchers at a National Weather Center in the northeastern United States recorded the number of…

A: The null hypothesis states that there is no effect of the treatment and alternative hypothesis…

Q: A certain machine makes electrical resistors having a mean resistance of 50 ohms and a standard…

A: According to the given information, we have Mean = 50 Standard deviation = 4