Determining normal distribution and standard deviation

Reference no: EM1391789

Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6.

a. Determine the probability that a randomly selected exam will have a score of at least 71?

b. What percentage of exams will have scores between 89 and 92?

Reference no: EM1391789

Questions Cloud

Estimating population and standard mean : Suppose the population standard deviation is a=25. (The a is actually the funny looking 0 with the line that goes from the top right up at an angle) Compute the standard error of the mean

Determine the queuing characteristics of buying a ticket : What waiting line model would you use to determine the queuing characteristics of buying a ticket for college football game where

Probability that contains no minorities : A company that has 200 employees chooses a committee of 15 to represent . When the committee is formed, none of the 56 minority employees are selected. if the committee is chosen randomly. What is the probability that it contains no minorities.

The understanding of the role of large organizations in mode : The analysis of how organizations select managers, how managers act, and how organizations are structured in different units. The understanding of the role of large organizations in modern society.

Determining normal distribution and standard deviation : Determine the probability that a randomly selected exam will have a score of at least 71? What percentage of exams will have scores between 89 and 92?

Waiting line divided by the average arrival rate : In infinite queuing theory, the average number in the waiting line divided by the average arrival rate yields what measures

Confidence interval for the proportion of smokers : What is the 95% confidence interval for the proportion of smokers in the population (to 4 decimals)?

What waiting line model would you use to determine : What waiting line model would you use to determine the queuing characteristics of buying a ticket for college football game where

Mean annual household consumption : Determine the mean annual amount spent on household consumption per family with a sample of 100 families, an average amount of $8,000 spent, and if the population standard deviation is $500,

User Account

All Pages