Page 153 - Revised Maths Wisdom Class - 6

Data Handling and Presentation 151

Exercise 10A
Exercise 10A
1. _________ is a collection of numbers gathered to give some meaningful information.

(a) Data (b) Information (c) Frequency (d) Observation
2. The number of times a particular observation occurs is called _________.
(a) Data (b) Information (c) Frequency (d) Observation

3. Represent the following numbers using tally marks.
(a) 12 (b) 8
4. A police radar unit measured the speed of 25 cars on a road. The resulting speeds were:
69, 63, 60, 60, 67, 55, 40, 55, 50, 40, 50, 63, 60, 69, 67, 60, 55, 50, 40, 63, 60, 60, 67, 55, 50

Prepare a frequency distribution table for this data.
5. Twenty five army inductees were given a blood test to determine their blood type. These were:
A, B, B, AB, O, O, O, B, AB, B, B, B, O, A, O, A, O, O, O, AB, AB, A, O, B, A

Prepare a frequency distribution table and find the most common blood type.
6. Ananya while using the calculator typed 40 random digits as listed below:

7, 2, 1, 0, 5, 4, 6, 9, 1, 1, 9, 9, 2, 1, 0, 3, 5, 9, 7, 5, 5, 4, 1, 0, 9, 3, 9, 3, 4, 6, 6, 7,8, 0, 1, 2, 3, 8, 7, 2
Prepare a frequency distribution table and find out the following:

(a) Which digit occurred the least number of times?
(b) Which digit occurred the most number of times?

7. A train company keeps a record of how many trains are late each day as follows:
5, 1, 4, 4, 2, 4, 3, 6, 8, 3, 3, 6, 3, 5, 5, 7, 4, 4, 4, 5, 4, 4, 3, 5, 6, 8, 9, 4
Prepare a frequency distribution table and find how many days had 7 or more trains late?

8. The weight of new born babies (in kg) in a hospital in a week is as follows:
2.3, 2.2, 2.1, 2.7, 2.6, 3.0, 2.5, 2.9, 2.8, 3.1, 2.5, 2.8, 2.7, 2.9, 2.4
(a) Rearrange the weights in ascending order.
(b) Determine the highest weight.
(c) How many babies weigh below 2.5 kg?

Pictograph

A pictograph (also known as pictogram) represents the frequency of data as pictures or symbols. Each picture
or symbol may represent one or more units of the data. The first part of the word “picto” comes from the Latin
“pictus” meaning painted. The second part, “graph” comes from the Greek “graphos” meaning to draw or write.
Thus the term “pictograph” means “painted writing”. In Mathematics, we use it to represent data. Let us learn
through examples.