statistics

posted by .

A population of scores is normally distributed with a μ = 40, and a σ = 13. What is the probability of randomly selecting a score greater than 54

  • statistics -

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. statistics

    Scores on a test are normally distributed with a mean of 68.2 and a standard deviation of 10.4. Estimate the probability that among 75 randomly selscted students, at least 20 of them score greater that 78.
  2. statistics

    Scores on the ACT test are normally distributed with a mean of 21.1 and a standard deviation of 4.8. If one ACT score is randomly selected, find the probability that it is greater than 20.
  3. statistics

    The mean (μ) of the scale is 98 and the standard deviation (σ) is 13. Assuming that the scores are normally distributed, what is the PROBABILITY that a score falls below 88?
  4. Statistics

    Suppose that you have a normally distributed population with unknown μ and standard deviation σ = 20. Given that the probability that a random observation X will fall within the range μ±E is .95 or 95%, find E.
  5. Statistics!

    Many companies "grade on a bell curve" to compare the performance of their managers and professional workers. This forces the use of some low performance ratings so that not all workers are listed as "above average." Ford Motor Company’s …
  6. MATH

    (4 pts) The score on an exam from a certain MAT 112 class, X, is normally distributed with \mu = 77.6 and \sigma = 10.9. NOTE: Assume for the sake of this problem that the score is a continuous variable. A score can thus take on any …
  7. psych 42

    The mean (μ) of the scale is 55 and the standard deviation (σ) is 7. Assuming that the scores are normally distributed, what PERCENTAGE of the population scores are above 59?
  8. statistics

    Membership in Mensa requires an IQ score above 131.5. Nine candidates take an IQ test and their summary scores indicate that their mean IQ score is 133. IQ scores are normally distributed and have a mean of 100 and a standard deviation …
  9. statistics

    The mean (μ) of the scale is 83 and the standard deviation (σ) is 10. Assuming that the scores are normally distributed, what is the PROBABILITY that a score falls below 72?
  10. statistic

    Assume that adults have IQ scores that are normally distributed with a mean of \mu=105μ=105and a standard deviation \sigma=20σ=20. Find the probability that a randomly selected adult has an IQ less than 145.

More Similar Questions