subject
Mathematics, 13.12.2020 09:20 needhhelp

The distribution of scores on a recent test closely followed a Normal distribution with a mean of 22 points and a standard deviation of 4 points.
A What proportion of the students scored at least 25 points on this test?
B. What is the 31st percentile of the distribution of test scores.
C. The teacher wants to transform the test scores so that they have an
approximately Normal distribution with a mean of 80 points and a standard
deviation of 10 points. To do this, she will use a formula of the form:
new score = a +b(old score) . Find the values of a and b that the teacher
should use to transform the distribution of test scores.
D. Before the test, the teacher gave a review assignment for homework. The
maximum score on the assignment was 10 points. The distribution of scores on
this assignment had a mean of 9.2 and a standard deviation of 2.1 points. Would
it be appropriate to use a Normal distribution to calculate the proportion of
students who scored below 7 points on this assignment? Explain.

ansver
Answers: 3

Other questions on the subject: Mathematics

image
Mathematics, 21.06.2019 18:00, sophiamoser
Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?
Answers: 1
image
Mathematics, 21.06.2019 18:30, singlegirlforlife541
Maria walks a round trip of 0.75 mile to school every day. how many miles will she walk in 4.5 days
Answers: 2
image
Mathematics, 21.06.2019 19:30, jrassicworld4ever
Need now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.
Answers: 1
image
Mathematics, 21.06.2019 22:00, fatherbamboo
Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4
Answers: 2
You know the right answer?
The distribution of scores on a recent test closely followed a Normal distribution with a mean of 2...

Questions in other subjects:

Konu
Geography, 29.06.2019 20:30