Question
In: Statistics and Probability
A large group of students took a test in physics and the final grades have a...
A large group of students took a test in physics and the final grades have a mean of 70 and a standard deviation of 10. If we can approximate the distribution of theses grades by a normal distribution, what percent of students a. Score higher than an 80 but less than 90? b. Should pass the test (grades > 60)? c. Should fail the test (grades < 60)? d. If you randomly sample 30 students, what is the probability that their average test score is higher than a 73
Solutions
Expert Solution
a) The percent of students a. Score higher than an 80 but less than 90 is
b)
c)
d) If you randomly sample 30 students, the probability that their average test score is higher than a 73 is
orchestra answered 1 year agoRelated Solutions
A large group of students took a test in Statistics and the final grades have a...
A large group of students took a test in Statistics and the
final grades have a mean of 70 and a standard deviation of 10. If
we can approximate the distribution of these grades by a normal
distribution, what percent of the students
a) scored between 50 and 90?
b) scored higher than 90?
c) should pass the test (grades≥50)
d)non of the above
d) should fail the test (grades<50)?
One out of 5 of a group of students took a math test, 28% of the same group took a science test and the rest took a history test.
One out of 5 of a group of students took a math test, 28% of the same group took a science test and the rest took a history test. If each student took one test only, what percent of students took a history test?
A test was given to a group of students. The grades and gender are summarized below...
A test was given to a group of students. The grades and gender
are summarized below A B C Total Male 6 17 16 39 Female 19 9 15 43
Total 25 26 31 82 If one student is chosen at random from those who
took the test, Find the probability that the student got a 'C'
GIVEN they are male
Giving a test to a group of students, the grades and gender are summarized below A...
Giving a test to a group of students, the grades and gender are
summarized below
A
B
C
Total
Male
3
12
6
21
Female
10
2
5
17
Total
13
14
11
38
Let ππ represent the percentage of all male students who would
receive a grade of C on this test. Use a 80% confidence interval to
estimate p to three decimal places.
Enter your answer as a tri-linear inequality using decimals (not
percents).
< p <
Giving a test to a group of students, the grades and gender are summarized below A...
Giving a test to a group of students, the grades and gender are
summarized below
A
B
C
Total
Male
3
12
6
21
Female
10
2
5
17
Total
13
14
11
38
Let ππ represent the percentage of all male students who would
receive a grade of C on this test. Use a 80% confidence interval to
estimate p to three decimal places.
Enter your answer as a tri-linear inequality using decimals (not
percents).
< p <
Giving a test to a group of students, the grades and gender are summarized below A...
Giving a test to a group of students, the grades and gender are
summarized below
A
B
C
Total
Male
6
15
12
33
Female
9
14
2
25
Total
15
29
14
58
If one student is chosen at random,
Find the probability that the student was
female:
Find the probability that the student was female AND got a
"A":
Find the probability that the student was female OR got a
"A":
If one student is chosen at random,...
Giving a test to a group of students, the grades and gender are summarized below A...
Giving a test to a group of students, the grades and gender are
summarized below
A
B
C
Total
Male
13
20
5
38
Female
10
2
6
18
Total
23
22
11
56
If one student is chosen at random,
Find the probability that the student was female:
Find the probability that the student was female AND got a
"A":
Find the probability that the student was male OR got an "B":
Find the probability that the student got...
Giving a test to a group of students, the grades and gender are summarized below A...
Giving a test to a group of students, the grades and gender are
summarized below
A
B
C
Total
Male
20
7
18
45
Female
5
17
15
37
Total
25
24
33
82
If one student is chosen at random,
Find the probability that the student was male:
Find the probability that the student was female AND got a
"A":
Find the probability that the student was female OR got an
"B":
Find the probability that the student was...
Giving a test to a group of students, the grades and genders are summarized below. A...
Giving a test to a group of students, the grades and genders are
summarized below.
A
B
C
Total
Male
14
11
3
28
Female
15
8
19
42
Total
29
19
22
70
If one student is chosen at random,
find the probability that the student was female OR received a
grade of "C". (Leave answer to four decimal places.)
According to Masterfoods, the company that manufactures
M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12%
are...
Giving a test to a group of students, the grades and gender are summarized below A...
Giving a test to a group of students, the grades and gender are
summarized below
A B C Total
Male 18 16 6 40
Female 13 19 15 47
Total 31 35 21 87
Let p represent the population proportion of all female students
who received a grade of B on this test. Use a 99% confidence
interval to estimate p to four decimal places if possible. < p
<
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