Question
In: Statistics and Probability
Exam grades: Scores on a statistics final in a large class were normally distributed with a...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of
70 and a standard deviation of 10. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals.
(a) Find the 42nd percentile of the scores.
(b) Find the 71st percentile of the scores.
(c) The instructor wants to give an A to the students whose scores were in the top 10% of the class. What is the minimum score needed to get an A?
(d) Between what two values are the middle 68% of the scores? (Enter the smaller number in the first box.)
Solutions
orchestra answered 1 year agoRelated Solutions
The final exam scores in a statistics class were normally distributed with a mean of 70...
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 less than 55% on the
exam?
Scores on a statistics final in a large class were normally distributed with a mean of...
Scores on a statistics final in a large class were normally
distributed with a mean of 72 and a standard deviation of 4 . Use
the Cumulative Normal Distribution Table to answer the
following.
(a) Find the 37 th percentile of the scores.
(b) Find the 70 th percentile of the scores.
(c) The instructor wants to give an A to the students whose
scores were in the top 12 % of the class. What is the minimum score
needed...
Scores on a statistics final in a large class were normally distributed with a mean of...
Scores on a statistics final in a large class were normally
distributed with a mean of 76 and a standard deviation of 9.
(a) Find the 25th percentile of the scores.
(b) Find the 79th percentile of the scores.
(c) The instructor wants to give an A to the students whose
scores were in the top 13% of the class. What is the minimum score
needed to get an A?
(d) Between what two values is the middle 60% of...
Scores on a statistics final in a large class were normally distributed with a mean of...
Scores on a statistics final in a large class were normally
distributed with a mean of 71 and a standard deviation of 8. Use
the Cumulative Normal Distribution Table to answer the
following.
(a) Find the 30th percentile of the scores.
(b) Find the 70th percentile of the scores.
(c) The instructor wants to give an A to the students whose
scores were in the top 5 % of the class. What is the minimum score
needed to get an...
Scores of students in a large Statistics class are normally distributed with a mean of 75...
Scores of students in a large Statistics class are normally
distributed with a mean of 75 points and a standard deviation of 5
points.
Find the probability that a student scores more than 80
points
If 100 students are picked at random, how many do you expect to
score below 70 points?
If top 10% of students obtain an A grade, how much should a
student obtain to get an A grade.
Suppose four students are picked at random, find...
An instructor hypothesizes that the variance of the final exam grades in her statistics class is...
An instructor hypothesizes that the variance of the final exam
grades in her statistics class is larger for male students than it
is for female students. The data from the final exam for the last
semester are as shown. Is there enough evidence to support her
claim, using a .01 level of significance?
Males
females
n1=16
s1-4.2
n2=18
s2=2.3
claim ………………………………................ ________________________
null hypothesis…………………………………. ________________________
alternative hypothesis………………………….. ________________________
Calculator Screen Name……………………… ________________________
test statistic ………………………… ________________________
pvalue/alpha comparison………………………. ________________________...
A statistics teacher believes that the final exam grades for her business statistics class have a...
A statistics teacher believes that the final exam grades for her
business statistics class have a normal distribution with a mean of
82 and a standard deviation of 8.
(1)Find the score which separates the top 10% of the scores from
the lowest 90% of the scores.
(2)
The teacher plans to give all students who score in the top 10%
of scores an A. Will a student who scored a 90 on the exam receive
an A? Explain.
(3)...
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?
The following are final exam scores for 30 students in an elementary statistics class.
The following are final exam scores for 30 students in an
elementary statistics class.
91
59
82
91
79
76
90
69
77
83
59
88
95
72
88
81
77
52
80
96
62
97
76
75
75
89
61
72
90
85
a.
Find the quartiles for this data______________________________.
b.
What is the Interquartile Range (IQR)_________________________?
c.
What percent of students got at least a 72 on their final
exam______________?
d.
Build a boxplot using the graphing calculator.
A sample of 10 students record their scores on the final exam for their statistics class....
A sample of 10 students record their scores on the final exam
for their statistics class. The mean of the sample is 81 with
sample standard deviation 7 points. Analysis of the 10 sample
values indicated that the population is approximately normal. We
wish to find the 95% confidence interval for the population mean
test scores.
1. What is the confidence level, c?
2. Which of the following is correct?
a. To find the confidence interval, a z-critical value should...
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