Question

Suppose the scores of students on a Statistics course are Normally distributed with a mean of 311 and a standard deviation of 40. What percentage of the students scored between 311 and 391 on the exam? (Give your answer to 3 significant figures.)

Answer #1

(1 point) Suppose the scores of students on a Statistics course
are Normally distributed with a mean of 226 and a standard
deviation of 67.
What percentage of the students scored between 226 and 360 on the
exam? (Give your answer to 3 significant figures.)
percent.
(1 point) Suppose the scores of students on an test are Normally
distributed with a mean of 186 and a standard deviation of 42. Then
approximately 99.7% of the test scores lie between the...

Suppose the scores of students on an homework are normally
distributed with a mean of 318 and a standard deviation of 40.
According to the empirical rule, what percentage of students scored
between 238 and 398 on the homework?
Answer: %

Suppose the scores of students on an hw are normally distributed
with a mean of 318 and a standard deviation of 40. According to the
empirical rule, what percentage of students scored between 238 and
398 on the hw?

A set of final examination grades in an introductory statistics
course is normally distributed, with a mean of 70 and a standard
deviation of 9.
What is the probability that the student scored below 88 on this
exam
What is the probability that a student scored between 61 and
92.5
The probability is 5% that a student taking the test scores
higher than what grade
If the professor grades on a curve --gives A’s to the top 10% of
the...

Suppose the scores of students on an exam are Normally
distributed with a mean of 303 and a standard deviation of 39. Then
approximately 99.7% of the exam scores lie between the numbers and
such that the mean is halfway between these two integers. (You are
not to use Rcmdr for this question.)

The final exam scores in a statistics class were normally
distributed with a mean of 70 and a standard deviation of five.
What is the probability that a student scored more than 75% on the
exam?

A set of final examination grades in an introductory statistics
course is normally distributed, with a mean of 73 and a standard
deviation of 8.2.
(i) What is the probability that a student scored below 91 on this
exam?
(ii) What is the probability that a student scored between 65 and
89?
(iii) Given that 15% of the students scored grade B. What is the
cut-off mark for grade B?

The final exam in a certain course has scores that are normally
distributed with a mean of 70.9 with a standard deviation of 6.1.
If 19 students are randomly selected, find the probability that the
mean of their final exam scores is less than 67.
Round your answer 4 places after the decimal
point.

The final exam in a certain course has scores that are normally
distributed with a mean of 82.4 with a standard deviation of 5.9.
If 23 students are randomly selected, find the probability that the
mean of their final exam scores is less than 84. Round your answer
4 places after the decimal point.

a set of final examination grades in an introductory
statistics course is normally distributed with a mean of 77 and a
standard deviation of 7 complete parts a through d.
a. what is the probability that a student scored below 89 on this
exam
b. what is the probability that a student scored between 70 and
93
c. the probability is 15% that a student taking the test scores
higher than what grade
d. if the professor grades on a...

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