In a Stat 346 class grades in the final had mean µ = 65 and standard deviation σ = 10 and are assumed to be normally distributed. 5% of the students were very successful and 10% of the students were unsuccessful. a. What is the lowest grade a student in the very successful grade group got? b. What is the highest grade a student in the unsuccessful grade group got?

Q: The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 250.1…

A: Empirical rule :  According to empirical rule ,  68% of data falls within the first standard…

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

A: Given that  Sample size n =9 Population standard deviation =3

Q: High school students from track teams in the state participated in a training program to improve…

A:

Q: Assume that the mathematics score on the SAT are normally distributed with a mean of 500 and a…

A: Given

Q: The National Sleep Foundation surveyed representative samples of adults in six different countries…

A: we have given that  n1=250 ,n2=250 ,xbar1=391 ,xbar2=426 ,s1=20 ,s2=44 alpha=0.05

Q: 14. The golf scores for a school team were normally distributed with a mean of 68 and a standard…

A:

Q: An entrance examination is to be conducted to 1600 ncoming freshmen students at Gordon college which…

A: Let X be the variable denoting score of the exmination. X ~ N (μ, σ) Given mean, μ = 85 standard…

Q: 6. Jared has a mean of 74 on his quizzes, with a standard deviation of 7. On his most recent quiz,…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Suppose the life span of a brand of lightbulbs is normally distributed with a mean of 2000 hours and…

A: It is given that  Mean, μ = 2000 Standard deviation, σ = 320 Z-Score, Z = ( X - μ )/σ

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated.

A: Population standard deviation, σ =3 inches Sample size n=6

Q: 30. The following scores were given by 6judges for a gymnasts performance in vault of an…

A:

Q: Assume that the mathematics scores on the SAT are normally distributed with a mean of 500 and a…

A: The mean is 500 and the standard deviation is 100.

Q: n a large section of a statistics​ class, the points for the final exam are normally​ distributed,…

A: Note: Since you have posted a question with multiple subparts, we will solve the first three…

Q: Find the standard deviation for the number of girls in groups of 14 births when p = 0.5

A: Binomial probability distribution is a type of discrete probability distribution.

Q: An instructor at a local community college noted that the grades of his students were normally…

A: The mean is 78 and the standard deviation is 10.

Q: The mean deviation of the data(1 * :2,9,9,3,6,9,4 from the mean is 2.23 3.23 O 2.57 O 3.57 O

A:

Q: 5. You recorded the time in seconds it took for 8 participants to solve a puzzle. The times were:…

A: In the given question we have to find the mean and median of the time of eight participants let tha…

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

A: Let "X" be the heights of students. X 67 74 70 70 65 62 60 68

Q: c. Analyzing marks of 15 students from Spring 2020, you found their mean to be 23.6 and standard…

A: Data given Summer 2020  23,18,17,24,27,18,14,29  Spring 2020  n=15, x̄=23.6, s=4.9

Q: Assume that the mathematics scores on the SAT are normally distributed with a mean of 500 and a…

A: normal distributionμ = 500σ = 100P(570<x<640) = ?

Q: Assume that the finishing times in a New York City 10-kilometer road race are normally distributed…

A: Hey, since there are multiple subparts posted, we will answer first three subparts. If you want any…

Q: 3.A very desperate student needs to have a passing grade in his major subject to graduate. He got…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: The scores of the students who took an exam in Statistics is normally distributed with a mean of 80…

A: Given that  mean = 80 , s.d = 4

Q: he time need to complete a math examination is bell-shaped with a mean of 90 ninutes and a standard…

A:

Q: Prestigious University desires to accept only the top20% of all graduating seniors based on the…

A: Given: μ=500σ=100 The top 20% is the cut-off score for the examination

Q: Following are the marks obtained by a batch of 9 students in a certain test. 65.3 , 45.6 , 35.9 ,…

A: Given: The marks obtained in a certain test is provided as:…

Q: . The scores of 400 applicants who took the examination in a certain company approximate normal…

A:

Q: Here are the monthly wage scales of 8 workers from XYZ Knit Works. 15 13 18 12 21 13 26 22 a.…

A: Given : Monthly wage scale of 8 workers from XYZ knit works Sample size (n) =8  X 15 13 18…

Q: d the mean and standard deviation of the number of red-headed Scots in a randomly selected group of…

A: Let X be the random variable from binomial distribution with probability of  red hair for Scottish…

Q: Ronnie and Loida who are best friends took a college entrance examination. The mean score and the…

A: The z score is used to estimate the number of observation deviation from the mean. The z score is…

Q: Assume that the heights of women are normally distributed with a mean of 63 inches and a standard…

A: A z-score is a numerical measurement that describes a values relationship to the mean of a group of…

Q: 5. The temperature in a glass house is normally distributed with a mean of 30 °C and a standard…

A: Let, X = Temperature in a glass house X~Normal(μ=30, σ2=32)