Standard deviation assignment

PART A ( MANUAL THROUGH FORMULAS: please show your work for partial credit) (10 points)

Age (years) Frequency

10 0

11 8

12 3

13 2

14 7


Q.1 Calculate the mean age in the data set of ages above.

Q.2 Calculate the median age in the data set of ages above.

Q.3 Calculate the mode of the age in the data set of ages above

(Note: remember that the column 2 of the data set shows frequency of each age, which means you have to find out the total number of ages first……)

Q.4. Calculate the standard deviation of the of the ages data set.


PART B (Excel ) (10 points)

Below is the monthly value of Dow Jones Index for one year from Jan 1st 2018 to Jan 1st 2019. Copy this data in excel and calculate the following by using the relevant formulae in excel.

a) Mean

b) Median

c) Mode

d) Standard deviation

e) Range

Date Close

1/1/2018 26149.39

2/1/2018 25029.20

3/1/2018 24103.11

4/1/2018 24163.15

5/1/2018 24415.84

6/1/2018 24271.41

7/1/2018 25415.19

8/1/2018 25964.82

9/1/2018 26458.31

10/1/2018 25115.76

11/1/2018 25538.46

12/1/2018 23327.46

1/1/2019 25063.89



PART C (Excel_ Data Analysis Tool Pak) (10 points)

Use the Dow Jones Index data in the part B, and perform descriptive statistics on it by using the Data

Analysis Tool Pak Add in. Display your summary statistics. Also interpret the performance of the index in

the year 2018 by analyzing the mean, median, mode, variance , standard deviation and other measures of descriptive statistics.

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