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    Dr.M.Mubashir Unnissa Mat2001 - Statististics For Engineers Practice Problem Sheet

    Uploaded by

    Chetan Cherry
    1. The document provides 13 practice problems involving calculating statistics such as mean, median, mode, standard deviation, and percentiles from data sets. 2. The problems cover a range of data including costs of cameras, wind velocities, test scores, earnings, sizes of items, and more. 3. Instructions are provided for calculating specific statistics for each data set, such as finding the mean, median, quartiles, and standard deviation.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Dr.M.Mubashir Unnissa Mat2001 - Statististics For Engineers Practice Problem Sheet

    Uploaded by

    Chetan Cherry
    57 views2 pages
    1. The document provides 13 practice problems involving calculating statistics such as mean, median, mode, standard deviation, and percentiles from data sets. 2. The problems cover a range of data including costs of cameras, wind velocities, test scores, earnings, sizes of items, and more. 3. Instructions are provided for calculating specific statistics for each data set, such as finding the mean, median, quartiles, and standard deviation.

    Original Description:

    statistics VIT

    Original Title

    stats Lab1b

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    1. The document provides 13 practice problems involving calculating statistics such as mean, median, mode, standard deviation, and percentiles from data sets. 2. The problems cover a range of data including costs of cameras, wind velocities, test scores, earnings, sizes of items, and more. 3. Instructions are provided for calculating specific statistics for each data set, such as finding the mean, median, quartiles, and standard deviation.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    57 views2 pages

    Dr.M.Mubashir Unnissa Mat2001 - Statististics For Engineers Practice Problem Sheet

    Uploaded by

    Chetan Cherry
    1. The document provides 13 practice problems involving calculating statistics such as mean, median, mode, standard deviation, and percentiles from data sets. 2. The problems cover a range of data including costs of cameras, wind velocities, test scores, earnings, sizes of items, and more. 3. Instructions are provided for calculating specific statistics for each data set, such as finding the mean, median, quartiles, and standard deviation.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    DR.M.

    MUBASHIR UNNISSA

    MAT2001 – STATISTISTICS FOR ENGINEERS

    PRACTICE PROBLEM SHEET

    1. The following table gives the average costs of a single-lens reflex camera:

    800 650 300 430 560 470 640 830


    400 280 800 410 360 600 310 370 Find Mean, Median, mode, standard deviation,
    quartile deviation, coefficient of quartile deviation, mean deviation, coefficient of mean
    deviation and coefficient of variation.

    2. The following are the wind velocities reported at 6 P.M. on six consecutive days: 13,8,15,11,3
    and 10. Find the range, mean and standard deviation.

    3. Suppose two machines produce nails which are on average 10 inches long. A sample of 11
    nails is selected from each machine.
    Machine A: 6, 8, 8, 10, 10, 10, 10, 10, 12, 12, 14.
    Machine B: 6, 6, 6, 8, 8, 10, 12, 12, 14, 14, 14.
    Which machine is better than the other?

    4. In a study on effectiveness of a medicine over a group of patients, the following results were
    obtained :
    Percentage of relief 0-20 20-40 40-60 60-80 80-100
    No. of patients 10 10 25 15 40
    Find the mean, median, quartile deviation and standard deviation.

    5. The data on ages of teachers working in a school of a city are given below:
    Age (in years) 20-25 25-30 30-35 35-40 40-45 45-50 50-55 55-60
    No. of teachers 25 110 75 120 100 90 50 30
    Calculate the mode, mean deviation from mean, coefficient of mean deviation, range,
    coefficient of range, coefficient of variation and standard deviation.

    6. The data below presents the earnings of 50 labourers of a factory


    Earnings (in Rs.) 1200 1300 1400 1500 1600 1800
    No. of Labourers 4 7 15 12 7 5
    Calculate mean deviation, quartile deviations and their coefficients.

    7. Find the batting average and mean deviation for the following data of scores of 50 innings
    of a cricket player:
    Run Scored 0-20 20-40 40-60 60-80 80-100 100-120
    No. of Innings 6 10 12 18 3 1

    8. Find the mean deviation from the mean, median, standard deviation and coefficient of
    variation of the following data :
    Size of items 4 6 8 10 12 14 16
    Frequency 2 5 5 3 2 1 4

    9. Calculate the mean deviation for the following data of marks obtained by 40 students in a test
    Marks obtained 20 30 40 50 60 70 80 90 100
    No. of students 2 4 8 10 8 4 2 1 1
    10. Find the standard deviation for the following distribution giving wages of 230 persons.
    Wages No. of persons Wages No. of persons
    (in Rs) (in Rs)
    70-80 12 110-120 50
    80-90 18 120-130 45
    90-100 35 130-140 20
    100-110 42 140-150 8

    11. Find the mode for the following data


    X: 10 20 30 40 50 60
    f: 4 6 20 8 7 6

    12. Find the median, Q1, D8,P65 from the following data.

    Marks 0-10 10-30 30-50 50-80 80-90 90-100


    No of Students 4 12 20 8 4 2
    13. The amount of time (in minutes) that a sample of students spends watching television
    per day is given below.
    40 25 35 30 20 40 30 20

    40 10 30 20 10 5 20

    (a) Compute the mean b) The standard deviation. (c) The coefficient of variation.
    (d) The 40th percentile.(e) The mode. (f) The interquartile range.

    Note : Geometric mean and Harmonic mean problems are not given
    &&&&&&&&&&&&

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