Directions: Read and analyze the given problems final answer on a separate sheet of paper. 1. ILAW Manufacturing company produces bulbs that last a mean of 900 hours with a standard deviation of 110 hours. What is the probability that the mean lifetime of a random sample of 15 of these bulbs is less than 850 hours? 2. A school principal claims that grade 11 students have a mean grade of 86 with a standard deviation of 4. Suppose that the distribution is approximately normal. What is the probability that a randomly selected grade will be greater than 82 but less than 90?

Q: The average temperature in Anchorage, Alaska, in January is 21'F with a standard deviation of 10°.…

A: For Anchorage, μ=21σ=10 Consider, the probability that the temperature in a January with a high of…

Q: The mean of a data set is 20 and the standard deviation is 2. What percentage of data value will…

A: Given  Mean=20, sigma=2 P(12<X<28)= ?

Q: A survey of 600 customers indicates that 75% own cars. a) What is the estimated standard deviation…

A:

Q: 10. Age of Senators The average age of Senators in the 108th Congress was 59.5 years. If the…

A: Given that Mean=μ=59.5 Standard deviation=σ=11.5 Find Z-score=(X-μ)/σ

Q: 5. Suppose the average age of family members is 34 with a standard deviation of 4. If 160 members of…

A:

Q: A. Missouri has an inmate suicide rate of 12. How many standard deviations from the national mean is…

A: A. The z score formula is, z=x-μσ In the formula x is defined as random variable, μ is population…

Q: The price of stock A has a higher standard deviation than the price of stock B.  This tells that:…

A: We have given that the statement “The price of stock A has a higher standard deviation than the…

Q: Challenge Question: The distances an athlete jumps are normally distributed with mean 5.2 m. If 15%…

A: The distances an athlete jumps normally distributed with mean of 5.2m. The 15% of jumps by athlete…

Q: The mean and standard deviation of a population are 200 and 20, respectively. Suppose samples of…

A: We have given that, Population mean (μ) = 200, standard deviation (σ) = 20 and sample size (n) = 36…

Q: If a set of data has a mean of 50 and a standard deviation of 4.5, what is the z-score for a value…

A: If a set of data has a mean of 50 and the standard deviation of 4.5. We have to find the z-score for…

Q: Use technology to solve the following problem: A survey reported that in a recent year, the mean…

A: The mean is 199 and the standard deviation is 35.

Q: A test is normally distributed with a mean of 70 and a standard deviation of 8. (a) What score would…

A: a What score would be needed to be in the 58th percentile. Therefore, the score at 85th percentile…

Q: After their final exams in Sociology, for which we have a mean of M - 74 and a standard deviation of…

A:

Q: The scores on an aptitude test are normally distributed with a mean of 18 and standard deviation of…

A: Note: Hey, since there are multiple subparts are posted, we will answer first three subparts for…

Q: find the probability that customers occupying 25 tables would have an average time of less than dine…

A: Given that mean =1.2,s.d =0.4,n =25

Q: 2. Suppose a distribution has a mean µ = 6 and standard deviation o = 2. What is the value of x if…

A:

Q: 1. The test scores of a Biostatistics examination follows a normal distribution with a mean of 60…

A:

Q: A distribution has a mean of 30 and a standard deviation of 5. Approximately 68% of the distribution…

A: according to the Empirical rule .

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

A:

Q: The scores of a freshman chemistry class in college have a mean of 70 and a standard deviation of 12…

A: C is the correct option. The scores of a freshman chemistry class in college have a mean of 70 and a…

Q: Refer to the accompanying table, which describes the number of adults in groups of five who reported…

A: Given : See the excel table

Q: The economic policy Institute periodically issues reports on workers wages. The Institute reported…

A: μm=37.39z=x-μσn

Q: An investor believes that the yields of his mutual funds have a normal distribution with an average…

A: The question is about normal dist. Given : Avg. yield ( μ ) = 10 % Std. deviation of yield ( σ ) = 2…

Q: Textbook Problem The Wall Street Journal reported that bachelor's degree recipients with majors in…

A: Provided information is, The wall street journal reported that bachelor’s degree recipients with…

Q: Question: In a manufacturing organisation, the distribution of wages was perfectly normal and the…

A:

Q: Refer to the accompanying table, which describes the number of adults in groups of five who reported…

A: There are 6 observations in the given table. The table represents probability distribution. We have…

Q: Question Engineers must consider the breadths of male heads when designing helmets. The company…

A:

Q: Problem: Suppose that an IQ scores of 100 students has a bell-shaped distribution with a Mean of 100…

A: It was stated that an IQ score of 100 students follows normal distribution. The mean IQ score is…

Q: A population has a mean of 150 and a standard deviation of 44. Suppose a sample of size 121 is…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: Refer to the accompanying table, which describes the number of adults in groups of five who reported…

A: Given,

Q: Problem: Suppose that IQ scores of 100 students has a bell-shaped distribution with a Mean of 100…

A: Given that: Mean of IQ scores is: μ=100 And standard deviation is: σ=15 For IQ score more than 130…

Q: Tom. The annual precipitation amounts in a certain mountain range are normally distributed with a…

A: Solution: 12. Let X be the annual precipitation amounts in a certain mountain range. From the given…

Q: In a Science class of 60 students, the mean general average of the students at the end of the sem is…

A: Given info: In a Science class of 60 students, the mean general average of the students at the end…

Q: A manufacturer of light bulbs produces bulbs that last a mean of 950 hours with a standard deviation…

A: Given μ=950σ=120n=10

Q: me sources report that the weights of full-term newborn babies in a certain town have a mean of 7…

A: Given:  X = Weight of new born babies  X follows normal distribution with mean = 7 pounds and…

Q: The following are the test scores of Janelle in all of her subjects. English - 45 Math - 42 Science…

A: Mean: For a set of n observations, x1, x2, ... , xn, mean is given by, Variance: For a set of n…

Q: 1.The test scores of Biostatistics examination follows a normal distribution with a mean of 60 and a…

A:

Q: Students in the psychology department at General State University consumes an average of 7 sodas per…

A: We have to find correct answer..

Q: Many firms use on-the-job training to teach their employees computer programming. Suppose you work…

A: It is provided that, many firms use on-the-job training to teach their employees computer…

Q: Refer to the accompanying table, which describes the number of adults in groups of five who reported…

A: Given Solution: The following is the data provided:

Q: Refer to the accompanying table, which describes the number of adults in groups of five who reported…

A:

Q: Which of the following is an example of doing inferential statistics? You calculate the average…

A: Inferential Statistics: One can analyze information and generate appropriate conclusions from the…

Q: To describe a normal distrribution, whicch two of the following are absolutely necesssary?   Group…

A: Solution: Normal distribution:  Normal distribution is type of continouous probability distribution…

Q: Using the Appendix Table A-1 in Statistical Psychology:  The mean for quiz#1 was 1.14, the standard…

A: Given : The mean for quiz#1 was 1.14, the standard deviation was .30. Define random variable X…

Q: The college physical education department offered an advanced first aid course last summer. The…

A: Solution: Let X represent the scores on the comprehensive final exam were normally distributed with…

Q: Activity 2: Toby's Trucking Company determined that the distance traveled per truck per year is…

A: The mean and standard deviation are μ=50,σ=12 Therefore the value of P34<x<50 is given by:…

Q: In a distribution of six scores, the deviations from the mean for five of the scores are +5, +3, +1,…

A: Hello. Since your question has multiple, we will solve first question for you. If you want remaining…

Q: Covert the following scores to z-scores if the mean is 50 and the standard deviation is 10: a. 76 b.…

A:

Q: There are 10 employees in a particular division of a company. Their salaries have a mean of $70,000,…

A: See the attached hand written answer

Q: Question in image provided

A: Given dataGiven dataHypothesized mean = 450Population Standard deviation = 100Sample mean =…

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.