Question

The following frequency distribution shows the price per share
for a sample of 30 companies listed on the New York Stock Exchange.
Price per Share Frequency $20-29
5 $30-39 5 $40-49
7 $50-59 4 $60-69
6 $70-79 2 $80-89

1 Compute the sample mean price per share and the sample standard
deviation of the price per share for the New York Stock Exchange
companies (to 2 decimals). Assume there are no price per shares
between 29 and 30, 39 and 40, etc.

What is the Sample mean $

What is the Sample standard deviation $

Answer #1

Answer)

We have

20-29. 5

30-39. 5

40-49. 7

50-59. 4

60-69. 6

70-79. 2

80-89. 1

Now we need to take the mid points of the values

24.5, 34.5...

Now we need to multiply them with their respective frequencies and add them

= (24.5*5) + (34.5*5)...

= 1445

Now we need to divide the result by sample.size = 30

Mean = 1445/30 = 48.167 = 48.17

To find the standard deviation

First we need to subtract mean from each and every mid point then we need to square them and multiply them with their respective frequency and atlast add them

5*(24.5-48.17)^2 + 5*(34.5-48.17)^2....

= 8296.667

Now, we need to divide the sum by sample size -1 that is by 29

And take the square root of the result

Sample standrad deviation = √{(8296.667/29)

= 16.914

= 16.91

Class Limits (Age in years) , Frequency
0-9 ,1
10-19, 7
20-29, 12
30-39 ,12
40-49, 23
50-59, 23
60-69 ,32
70-79 ,9
80-89 ,4
90-99, 1
Find the mean, calculate sample variance and sample standard
deviation,

Classes
Frequency
20-29
7
30-39
7
40-49
12
50-59
3
60-69
3
70-79
6
80-89
2
The ages of a sample of individuals in an GSS study are as shown
in the table above.
a. Obtain the mean score for the data
b. Obtain the median for the data
c. Obtain the first quartile for the data
d. Obtain the third quartile for the data
e. Find the IQR
a.=
b.=
c.=
d.=
e.=

Construct the cumulative frequency distribution for the given
data.
Age (years) of Best Actress when award was won
Frequency
20-29
2828
30-39
3737
40-49
1414
50-59
22
60-69
77
70-79
22
80-89
22
Age (years) of Best Actress when award was won
Cumulative Frequency
Less than 30
nothing
Less than 40
nothing
Less than 50
nothing
Less than 60
nothing
Less than 70
nothing
Less than 80
nothing
Less than 90
nothing

The price per share of stock for a sample of 25 companies was
recorded at the beginning of 2012 and then again at the end of the
1st quarter of 2012. How stocks perform during the 1st quarter is
an indicator of what is ahead for the stock market and the economy.
The sample data are provided in the Excel Online file below.
Construct a spreadsheet to answer the following questions.
End of 1st Quarter
Beginning of Year
26.13
18.71...

The following is the frequency distribution for the speeds of a
sample of automobiles traveling on an interstate highway.
Speed (mph)
Frequency
50−54
2
55−59
4
60−64
5
65−69
10
70−74
9
75−79
5
35
The mean is 67
How to find the Variance?

Age
Frequency
Midpoint
f*M
f*(M-xbar)2
30-39
2
40-49
3
50-59
7
60-69
5
70-79
1
Compute the Coefficient of Variation to 2 decimal places.
Do NOT format answer: No $, Commas, %.

C) Calculate the mean, mode, median, P65 for the following data:
75, 89, 89, 89, 56, 77, 99, 91, 80, 76, 84, 83, 101, 111, 94. (Show
all process to reach the final result).
D) Find the mean for the following frequency distribution: (Show
all the
process to
reach the final result).
Limits
Frequency
30-39
15
40-49
6
50-59
12
60-69
7
70-79
10
80-89
13
90-99
8

You are a teacher of a
group of 30 students and then take the test.
56
50
45
42
33
34
42
55
58
51
50 48
34
42
48
49
30
25
22
44
56
52
48 49
48
40
45
51
47 39.
1. Organize the scores
into a simple frequency distribution.
2. Calculate the fashion
3. Calculate the median
4. Calculate the average
5. Calculate the Mean Deviation
6. Calculate the Standard Deviation of the scores...

Find the measures of center for the following:
Data Frequency
30-34
2
35-39
4
40-44
6
45-49
11
50-54
18
55-59
15
60-64
11
65-69
1
70-74
5
mode=
median=
mean (round to 4 decimal places)=

The price per share of stock for a sample of 25 companies was
recorded at the beginning of 2012 and then again at the end of the
1st quarter of 2012 (The Wall Street Journal, April 2, 2012). How
stocks perform during the 1st quarter is an indicator of what is
ahead for the stock market and the economy. Use the sample data in
the file entitled Stock Prices to answer the following.
a. Let d denote the change in...

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