The average age of our class is 22.3 years.  The standard deviation is 4.7 years.  If the variable is normally distributed:Find the probability a student is between 20 and 30 years old.

Q: A senior high student commutes daily from home to school. The average time for one way. trip is 20…

A:

Q: Suppose that the walking step lengths of males are normally distributed with a mean of 2.5 feet and…

A: We have to find given probability.

Q: According to Money magazine, Maryland had the highest median annual household income of any state in…

A:

Q: bank’s loan officer rates applicants for credit.  The ratings are normally distributed with a mean…

A: Given,

Q: The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation…

A: (a)   Obtain the probability that pregnancy will last 307 days or longer. The probability that…

Q: It takes an average of 6 weeks to grow lettuce in a hydroponics system. The time it takes to... grow…

A: Normal distribution probability calculation

Q: A particular fruit's weights are normally distributed, with a mean of 722 grams and a standard…

A:

Q: An insurance salesperson sells an average of 4.90 policies per day. Let x denote the number of…

A:

Q: how much will the probability that the students are aged above 15 years old change?

A:

Q: Working in the garden pulling weeds/planting flowers burns an average of 200 calories per hour. If…

A: given data μ=200σ=9normal distribution P(200<x<225)=?

Q: Provide an appropriate response. Use the Standard Normal Table to find the probability. IQ test…

A: Solution : Mean, μ = 100 Standard deviation, σ = 15 z score corresponding to the value of IQ score,…

Q: IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one individual…

A: let X: IQ X~N(μ,σ)where, mean(μ)=100    and standard deviation(σ)=15

Q: The average number of pounds of red meat a person consumes each year is 196 with a standard…

A: Answer Sample size [n] =50Mean =196Standard deviation =22

Q: The average life of a smartphone is 7 years with a standard deviation of 1 year. Assuming that the…

A: Let X denotes the life of smartphones. Given that X follows approximately N(μ=7,σ2=12). The sample…

Q: Cody took his first physics exam and scored an 80. The population mean for this exam is 70, and the…

A: Solution: It is given that, Population mean, 70 Standard deviation, 5 Given that Cody took his first…

Q: Renee scores an average of 159 points in a game of bowling, and the points are normally distributed.…

A:

Q: The population mean for the average weigh of 12 year old children is 102 pounds and the population…

A: Solution: Let X be the weight of 12 year old children. From the given information, µ=102 pounds,…

Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

A: Let X = distance in feet for a fly ball. Use excel formula "=NORM.S.INV(0.8416)" to find the…

Q: Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard…

A: Let "X" be the IQ score of the adults.

Q: At an airline company, according to the records, the mean age of pilots is 36.2 years, and the…

A:

Q: A set of exam scores is normally distributed and has a mean of 79.3 and a standard deviation of 7.4.…

A: Given datanormal distribution μ=79.3σ=7.4choose a random score less than or equal to this 0.0078we…

Q: The average age of the company’s presidents is 60 years old. Assume the variable is normally…

A: Given data :  μ=60σ=5

Q: Trucks in a delivery fleet travel a mean of 130 miles per day with a standard deviation of 39 miles…

A: The data on per day mileage of a delivery truck is normally distributed. Population mean, Population…

Q: what is the probability that you will receive a grade that is between 89 and 97 on this exam?

A: The mean of grades for the latest statistics exam is 93 and SD is 4.

Q: The weights of steers in a herd are distributed normally. The standard deviation is 200lbs. and the…

A: Let "X" be the weight of steers in a herd.

Q: The daily high temperature for the month of August in Chicago is normally distributed with a mean of…

A: Let X be the high temperature for the month of August in Chicago is normally distributed with a mean…

Q: The average amount of snow per year in Whiteville is 32 inches. The standard deviation is 4 inches.…

A:

Q: A​ bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean…

A: It is given that the ratings are normally distributed with mean 200 miles and standard deviation 50.

Q: the length of time it takes college students to find a parking spot follows a normal distribution…

A: Given, μ=5 minutesσ=1 minutes

Q: Lisa has collected data to find that the number of pages per book on a book shelf has a normal…

A: The empirical rule states that 68% of the data lies within one standard deviation from the mean and…

Q: A population is normally distributed with a mean of 50 and a standard deviation of 10. Find the…

A: Given data,Mean μ=50sd    σ=10P(X<44)=?

Q: The life of light bulbs is distributed normally. The standard deviation of the lifetime is 36 hours…

A: Answer: From the given data, mean(μ) = 500 standard deviation (σ) = 36 X~ Norma(500,36) at most 508…

Q: Find the indicated probability. The weekly incomes of a summer intern in Tesla are normally…

A: Given data,Mean μ=1500sd    σ=300P(X<1200)=?

Q: e z scores to compare the given values. recent awards ceremony, the age of the win the standard…

A: Actor=X , Actress=Y X=35  ,  Mean=47.6 , Standard deviation=6.7 Y=48  , Mean=35.6 , Standard…

Q: The sales of a salesman average $500 with a standard deviation of $15.2. He gets a $100 commission…

A: The sales of a salesman average $500 with a standard deviation of $15.2. He gets a $100 commission…

Q: A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean…

A:

Q: A fair coin is tossed three times (consecutively). If X is the number of heads of the first shot and…

A: It is an important part of statistics . It is widely used .

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.