Question
In: Statistics and Probability
A set of final examination grades in an introductory statistics course is normally distributed, with a...
A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 7 and a standard deviation of 9.
What is the probability that a student scored between 66 and 99?
Solutions
orchestra answered 1 year agoRelated Solutions
A set of final examination grades in an introductory statistics course was found to be normally...
A set of final examination grades in an introductory statistics
course was found to be normally distributed with a mean of 73 and a
standard deviation of 8.
What is the probability of getting a grade of 79 or less?
What percentage of students scored between 61 and 81?
What is the probability of getting a grade no higher than 72
(less than 72) on this exam?
A set of final exam grades in ST2500 course is normally distributed with mean 70 and...
A set of final exam grades in ST2500 course is normally
distributed with mean 70 and standard deviation of 8. (a) What is
the probability of getting a grade of A(greater or equal 80) on
this exam? (4) (b) What is the probability of that a student scored
between 65 and 79? (4) (c) The probability is 10% that a student
taking the exam scores higher than what grade?
A set of final grades in an introductory probability class in section A is normal distributed...
A set of final grades in an introductory probability class in
section A is normal distributed with mean 70 and standard deviation
of 10 : G1 ~ N (70,100). a) what is probability that grade of
randomly chosen student is 77 or less? b)what is probability that
average grade of 9 randomly chosen students is 77 or less? c) only
2% of the students scored higher that what grade? d) A set of final
grades in an introductory probability class...
The following data set represents the final grades assigned in a statistics course. The grades are...
The following data set represents the final grades assigned in a
statistics course. The grades are as followed, 60, 50, 85, 85, 85,
90, 100, 70, 83, 92, 68, 70, 88, 88, 85, 90, 20, 100, 90, 80,
77
1. Professor Williamson believes that the average grade she
would assign would be an 85. Is she correct?
2. Determine an appropriate alpha level for the given data set
and justify your reason
3. Create your null and alternate hypothesis
4....
Suppose that the final grades in a stats course are approximately Normally distributed, with an average...
Suppose that the final grades in a stats course are
approximately Normally distributed, with an average grade of 83 and
a SD of 5. A student is randomly selected.
a.) what is the probability that the selected student received
an A (at least 90)?
b.) the students know that their final grade is at the 81st
percentile. Show whether or not that students grade is an A.
c.) if the students final grade is a least a B-, what is...
Two different professors teach an introductory statistics course. The table shows the distribution of final grades...
Two different professors teach an introductory statistics
course. The table shows the distribution of final grades they
reported. We wonder whether one of these professors is an "easier"
grader. Answer parts a) and b) below.
Prof. Alpha Prof. Beta
A 5 10
B 12 12
C 15 8
Below C 13 3
a) Find the expected counts for each cell in this table.
(Round to two decimal places as needed.)
Prof. Alpha Prof. Beta
A (blank) (blank)
B (blank)...
The final marks in a statistics course are normally distributed with a mean of 70 and...
The final marks in a statistics course are normally
distributed with a mean of 70 and a variance of 100. The professor
must convert all marks to letter grades. He decides that he wants
10% A's, 30% B's, 40% C's, 15% D's and 5% F's. Determine the
cutoffs for each letter grade.
The time needed to complete a final examination in a particular college course is normally distributed...
The time needed to complete a final examination in a particular
college course is normally distributed with a mean of 83 minutes
and a standard deviation of 13 minutes. Answer the following
questions.
a. What is the probability of completing the exam
in one hour or less (to 4 decimals)?
b. What is the probability that a student will
complete the exam in more than 60 minutes but less than 75 minutes
(to 4 decimals)?
c. Assume that the class...
The time needed to complete a final examination in a particular college course is normally distributed...
The time needed to complete a final examination in a particular
college course is normally distributed with a mean of 83 minutes
and a standard deviation of 13 minutes. Answer the following
questions. Round the intermediate calculations for z value to 2
decimal places. Use Table 1 in Appendix B. What is the probability
of completing the exam in one hour or less (to 4 decimals)? What is
the probability that a student will complete the exam in more than...
1. The time need to complete a final examination in a college course is normally distributed...
1. The time need to complete a final examination in a college
course is normally distributed with a mean of 80 minutes and a
standard deviation of 10 minutes. a. What is the probability of
completing the exam in less than 60 minutes? b. What is the
probability of completing the exam in less than 95 minutes? c. What
is the probability of completing the exam in more than 75 minutes?
d. What is the probability of completing the exam...
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