Statistics of Grouped Data

Using the grouped data, solve for the standard deviation.

• 9.993

• 9.789

• 10.789

• 9.399

For the following data find the SAMPLE standard Deviation by Calculator

• 20.2

• 13

• 14.1

• 13.99

What does "n" represent?

• Total Frequency

• width

• midpoint

• mean

For the given Grouped Freq. Dist. Find the Midpoints

• 4, 14, 24, 34, 44

• 5, 15, 25, 35, 45

• 4.5, 14.5, 24.5, 34.5, 44.5

• None of the above

Given above are marks obtained by 20 students in Math out of 25, presented in grouped frequency distribution table. Identify the lower class boundary for each class.

• 11, 16, 21

• 11.5, 16.5, 21.5

• 10.5, 15.5, 20.5

• 15.5, 20.5, 25.5

Choose the correct frequency distribution table for the data of annual attendance of 40 students in standard IX, using the class intervals 155 - 165, 165 - 175 and so on. Annual attendance: 171, 183, 192, 168, 156, 162, 158, 159, 178, 192, 186, 173, 169, 162, 182, 191, 194, 169, 174, 158, 186, 174, 176, 181, 179, 193, 164, 176, 159, 158, 166, 168, 187, 188, 192, 194, 166, 173, 179, 187

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Answer explanation

What is the width of the Grouped Frequency Distribution given.

• 9

• 10

• 100

• 39

Estimate the mean weight

• 63.5

• 65

• 67.2

• 70.1

For this grouped data, what is the mean?

• 20

• 25

• 27

• 30

The table gives the frequency distribution of the number of orders received each day during the past 50 days at the office of a mail-order company. Calculate the mean.

• 14.6

• 16.6

• 18.6

• 20.6