Question 864798: I need help by next friday. thanks
#7
Find the median for the following data.
Round your answer to 2 decimal places as needed.
49
2
94
54
83
96
32
75
27
26
29
14
4
41
Median =
Points possible: 1
This is attempt 1 of 3.
#11
Find the standard deviation for the following data.
Round your answer to 2 decimal places as needed
56
81
93
29
30
28
34
35
17
83
standard deviation =
Points possible: 1
This is attempt 1 of 3.
#12
Find the standard deviation for the following data.
Round your answer to 2 decimal places as needed
80
75
25
63
99
29
15
67
3
82
12
42
33
73
standard deviation =
Points possible: 1
This is attempt 1 of 3.
#13
The grades for 30 students on the most recent exam are given in the data table below:
Round your answer to 2 decimal places as needed
60
60
60
90
90
60
70
80
60
80
60
80
80
60
70
80
60
60
60
90
60
70
90
80
90
80
60
60
70
90
What is the mean score for the exam?
What is the median score for the exam?
What is the standard deviation for the exam?
Points possible: 6
This is attempt 1 of 3.
#14
60 students were surveyed about how many nights in a week they work on homework problems in their MAT142 class. The results of the survey are shown below:
Round your answer to 2 decimal places as needed
5
3
6
2
3
2
7
1
4
6
4
2
4
5
6
6
1
3
2
7
3
1
1
5
6
3
7
5
7
6
5
5
2
4
6
4
6
5
5
3
4
1
4
1
6
3
6
6
5
1
6
1
1
6
5
7
2
4
5
1
What is the mean number of days of homework?
What is the median number of days of homework?
What is the standard deviation for days of homework?
Points possible: 6
This is attempt 1 of 3.
For 13 and 14 i know the mean and kinda need help on the median and the last one. but i know the mean. thanks
Answer by richard1234(7193)   (Show Source):
You can put this solution on YOUR website! The median of a sorted (in increasing order) list of numbers is the middle number in the list. If the number of numbers is even, the median is defined as the average of the middle two. e.g. the median of {2,8,7,5,1} is 5 because {2,8,7,5,1} sorted in increasing order is {1,2,5,7,8}, and the median of {1,2,3,4,5,6} is 3.5.
The standard deviation  of a list of numbers  with mean  is defined as
^2}{n}} = \sqrt{ \frac{(x_1 - \mu)^2 + (x_2 - \mu)^2 + \ldots + (x_n - \mu)^2}{n})
In other words, the variance ( ) gives the mean of the square of the distances away from the mean. Since you have a large set of numbers, it'll be better done with a calculator.
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