What percentage of teenagers sleep less than 9 hours?

Q: The grade point average of students at a university is normally distributed, with a mean of 2.6 and…

A:

Q: Assume the annual day care cost per child is normally distributed with a mean of $6000 and a…

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

Q: Assume that the time the student stays in school is normally distrībuted with a mean of 5 hours and…

A:

Q: Medical research suggests that systolic blood pressure in adults is approximately normally…

A: Denote X as the blood pressure in adults. It is given that X is approximately normally distributed,…

Q: It is estimated that amounts of money spent on gasoline by customers at a gas station follow a…

A: Given info: amounts of money spent on gasoline by customers at a gas station follow a normal…

Q: find an 80th percentile of the distribution of the average of 49 flyballs

A: Let M denote the average distance of fly balls for the sample of size n = 49.

Q: Assume that the number of pieces per bag has a mean of 72 with a standard deviation of 1.use the…

A: We have to find given probability by using emperical rule...

Q: The number of Facebook friends students at a university have are approximately Normally distributed…

A: GivenMean(μ)=1200standard deviation(σ)=200

Q: The average time taken for your Internet service provider to remotely resolve a trouble ticket has a…

A: It is provided that,Mean (µ) = 4.343Standard deviation (σ) = 3.131.

Q: The incubation time for Rhode Island Red chicks has a Normal distribution with a mean of 21 days and…

A: The incubation time is normally distributed with mean 21 days and standard deviation of 1 day.

Q: Hours of sleep per night for an adult are normally distributed with a mean of 7.2 hours and a…

A: From the provided information, Mean (µ) = 7.2 hours Standard deviation (σ) = 1.9 X ~N (7.2, 1.9)…

Q: The patient recovery time from a particular surgical procedure is normally distributed with a mean…

A: We have given that.    X~N( μ , ?^2 )    μ = 5.1      , ? = 1.8   Z-score =( x - μ )/?

Q: Suppose the number of Covax and Pfizer vaccine bought by the Philippine government are normally…

A: Let, X=the number of vaccine μ =mean σ = sd

Q: If the mean asset turnover for retail firms is 2.17 with a standard deviation of .18 without…

A:

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

A:

Q: Assume that the time a student stays in school is normally distributed with a mean of 5 hours and a…

A: Given: μ=5 and σ=0.5.   The z-score is calculated asz=x-μσ

Q: The daily sleep duration among college students is normally distributed with a mean of 8.13 and…

A: Here we will find the standard deviation of average sleep time,

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

A: Let "X" be the lengths of pregnancies in a small rural village in days.

Q: The duration of human pregnancies are normally distributed with a mean of 267 days and a standard…

A: X follows a Normal distribution with mean = 267 and S.D = 16 Then z=(x-mean)/SD = (x-267)/16…

Q: For woman at Hartford college, times to run 400 meters are normally distributed with a mean of 85…

A: Solution: Let X be the time to run 400 meters. From the given information, X follows normal…

Q: The time required for a citizen to complete the 2000 U.S. Census '' long'' form is normally…

A:

Q: Tommy Wait, a minor league baseball pitcher, is notorious for taking an excessive amount of time…

A: Let X denote the times between pitches. Given that X follows N(mean = 33, SD = 2.5), then Z = (X -…

Q: Suppose that blood chlorine concentration (mmol/L) has a normal distribution with mean=98 and…

A: Given that blood chlorine concentration has a normal distribution with, Mean = 98 Standard deviation…

Q: The patient recovery time from a particular surgical procedure is normally distributed with a mean…

A: It is given that the mean is 5.9 and standard deviation is 2.1.

Q: In a sample of 240 workers, in a factory the mean and standard deviation of wages were $ 113.50 and…

A:

Q: The number of pizzas consumed per month by university students is normally distributed with a mean…

A: Let X be the number of pizzas consumed per month follows normal distribution with mean 10 and…

Q: are normally distributed with a mean of 100 and a standard deviation of 15. What IQ is in the 90th…

A: Kwe have to find out given probabiity..

Q: The number of shots on goal in an amateur hockey league's games is normally distributed, a mean of…

A: Let X=the number of shots X follows a normal distribution with mean= 56.3 and standard deviation=…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 270 days…

A: Let "X" be the lengths of pregnancies in a small rural village in days.

Q: The distribution of average hours of sleep per weeknight among college students is found to be…

A:

Q: What is the greatest amount of time that a newborn can sleep and still be in the bottom 75% of…

A: Let , X→N(μ=15.5 , σ=1.6) Our aim is to find the greatest amount of time that a newborn can sleep…

Q: Tommy Wait, a minor league baseball pitcher, is notorious for taking an excessive amount of time…

A: The mean and standard deviation are 190 and 2.3, respectively.

Q: The incubation time for Rhode Island Red chicks has a Normal distribution with a mean of 21 days and…

A: Here, mean is 21 and standard deviation is 1

Q: The heights of English men are normally distributed with a mean of 69.2 inches and a standard…

A: given mean  (μ= 69.2 )   standard deviation(σ)  = 4      z= (x-μ)/σ p(x<57.2) =P((x-μ)/σ  <…

Q: The daily sleep duration among college students is normally distributed with a mean of 8.13 and…

A: We have given that,  Let X be the random variable from normal distribution with mean(μ) = 8.13 and…

Q: In a normal distribution of wait times for roller coaster ride, the average wait time was 45 mins…

A: Given Information: Mean wait time (u) = 45 minutes Standard Deviation (s) = 12.2 minutes

Q: The distribution for the time a patient of a medical center spends waiting for an appointment is…

A: Solution: Let X be the time a patient of a medical center spends waiting for an appointment. From…

Q: The number of Facebook friends students at a university have are Normally distributed with a mean…

A: Normally distributed with a mean = 1200  Standard deviation = 200

Q: The mean and standard deviation for the quality grade point averages of a random sample of 28 senior…

A:

Q: According to a recent report the battery life for a new line of laptop computers has a mean of 9…

A: The normal distribution:A continuous random variable X is said to follow normal distribution if the…

Q: Assume that the number of pieces per bag has a mean of 78 with a standard deviation of 1. use the…

A:

Q: Suppose the number of Covax and Pfizer vaccine bought by the Philippine government are normally…

A: Let, X=the number of vaccine μ =mean σ = sd

Q: In order to qualify for police academy training, recruits are given a test of stress tolerance. The…

A: From a given information, Mean = 250 Standard deviation = 18

Q: Suppose the total weight of passengers and luggage on an airline flight is normally distributed…

A: Mean(µ) = 8914 Standard deviations (σ) = 32 X ~ N (µ, σ )= N(8914, 32)

Q: Suppose the heights of men are normally distributed with mean, μ = 69 inches, and standard deviation…

A: From the provided information, Mean (µ) = 69 inches Standard deviation (σ) = 3 inches Let X be a…

Q: the height of American men is normally distributed with a mean of 70 in and a standard deviation of…

A:

Q: Assume that the time a student stays in school is normally distributed with a mean of 5 hours and a…

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…

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.