statistics

posted by .

What z-score values form the boundaries for the middle 60% of a normal
distribution?
a. z = +0.25 and z = –0.25
b. z = +0.39 and z = –0.39
c. z = +0.52 and z = –0.52
d. z = +0.84 and z = –0.84

  • statistics -

    How about d?

  • statistics -

    what was the answer???

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Statistics

    a normal distribution ha am ean of 80 with a standard deviation of 20. what score separates the highest 15% of the distribution from the rest of the score?
  2. statistics

    A distribution of values follows a N(140,22) distribution. From this distribution you are drawing samples of size 12. Find the interval containing the middle-most 34% of the sample means. Round your values to 1 decimal place.
  3. statistics

    For a normal distribution with µ = 200 and ó = 50, what X values form the boundaries for the middle 60% of the distribution?
  4. statistics

    For a normal distribution with a mean of 140 and a standard deviation of 55 find each value requested. a. What is the minimum score needed to be in the bottom 10% of the distribution?
  5. Statistics

    The next three questions refer to the following situation. Data from previous years reveal that the distribution if first exam scores in an introductory statistics class is approximately normal with a mean of 72 and a standard deviation …
  6. Statistics

    Consider the standard normal distribution. Find the area for the z-score -0.75. Draw a picture of this distribution showing the location of the z-score and the mean. Shade the region corresponding to the area found for the z-score.
  7. statistics

    Find the Z-score that separate the middle 63% of the distribution from the area in the tails of the standard normal distribution
  8. Statistics

    Scores on the SAT form a normal distribution with u=500 and o=100. a. You are trying to qualify for a scholarship and find out that you need to have a higher score than at least 75% of the students. What score will you need?
  9. stats

    A particular normal distribution has mean of 575 and standard deviation of 150. What X values form the boundaries for the middle 60% of the data?
  10. statistics

    a normal distribution has a mean of 20 and a standard deviation of 10. Two scores are sampled randomly from the distribution and the second score is subtracted from the first. What is the probability that the difference score will …

More Similar Questions