Question

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, %.**

Answer #1

**Mean:**

Xbar =

**Midpoint = (Upper Class limit + Lower class limit) /
2**

For First Class:

Midpoint = (30+39)/2 = 34.5

Similarly, solve for other classess...

**Computational table:**

Age |
Frequency (f) |
Midpoint (M) |
f*M |
f*(M-xbar)^{2 } |

30-39 | 2 | =(30+39)/2 = 34.5 | 69 | 800 |

40-49 | 3 | =(40+49)/2 = 44.5 | 133.5 | 300 |

50-59 | 7 | =(50+59)/2 = 54.5 | 381.5 | 0 |

60-69 | 5 | =(60+69)/2 = 64.5 | 322.5 | 500 |

70-79 | 1 | =(70+79)/2 = 74.5 | 74.5 | 400 |

Total |
18 |
981 |
2000 |

**standard deviation (S):**

**Coefficient of variation (CV):**

CV = (S/)*100

CV = (10.54 / 54.5)

**CV = 0.19**

Age
range (yr)
20-29
30-39
40-49
50-59
60-69
70-79
80+
Midpoint x
24.5
34.5
44.5
54.5
64.5
74.5
84.5
Percent of nurses
5.9%
9.6%
19.4%
29.5%
24.9%
8.7%
2.0%
(c) Find the probability that a British nurse selected at random
in 1851 would be 60 years of age or older. (Round your answer to
three decimal places.)
(d) Compute the expected age μ of a British nurse contemporary to
Florence Nightingale. (Round your answer to two decimal
places.)
yr
(e)...

Age range (yr)
20-29
30-39
40-49
50-59
60-69
70-79
80+
Midpoint x
24.5
34.5
44.5
54.5
64.5
74.5
84.5
Percent of nurses
5.6%
9.1%
19.3%
29.7%
24.5%
10.1%
1.7%
What was the age distribution of nurses in Great Britain at the
time of Florence Nightingale? Suppose we have the following
information. Note: In 1851 there were 25,466
nurses in Great Britain.
Compute the standard deviation σ for ages of nurses shown in the
distribution. (Round your answer to two decimal places.)

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.=

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,

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)=

please do it in
Excel
Classes
F
x
10-19
2
4
20-29
19
23
30-39
7
68
40-49
2
4
50-59
1
1
60-69
0
0
1. Mean
2. Median
3. Mode
4. Standard divition
5. quartiles, percentiles and the correlation
coefficient

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 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...

Age
18-21
22-29
30-39
40-49
50-59
60 and over
Responded
73
255
245
136
138
202
Refused
11
20
33
16
27
49
A. If two selections are made with replacement, find the
probability that both people refused to respond.
B. If two selections are made without replacement, find the
probability that both people refused to respond.
C. Compare the results from parts (a) and (b). Should we treat
the two selections as independent or dependent events?
***Please show all...

What was the age distribution of nurses in Great Britain at the
time of Florence Nightingale? Suppose we have the following
information. Note: In 1851 there were 25,466 nurses in
Great Britain.
Age
range (yr)
20-29
30-39
40-49
50-59
60-69
70-79
80+
Midpoint x
24.5
34.5
44.5
54.5
64.5
74.5
84.5
Percent of nurses
5.8%
9.3%
19.9%
29.4%
25.2%
8.8%
1.6%
(d) Compute the expected age μ of a British nurse contemporary
to Florence Nightingale. (Round your answer to two...

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