Practicing Class 8 Maths MCQ and Class 8 Maths Part 2 Chapter 5 Tales by Dots and Lines MCQ Questions Online Test with Answers daily helps in time management.
MCQ on Tales by Dots and Lines Class 8
Tales by Dots and Lines MCQ Class 8
Class 8 Tales by Dots and Lines MCQ
Multiple Choice Questions
Question 1.
The arithmetic mean of a set of numbers is
(a) the middle value when data is arranged.
(b) the most frequently occurring value.
(c) the sum of values divided by total number of values.
(d) the difference between highest and lowest values.
Answer:
(c) the sum of values divided by total number of values.
Question 2.
For the numbers 3 and 7, the mean is
(a) 3
(b) 5
(c) 7
(d) 14
Answer:
(b) 5
Question 3.
If every value in a data set is doubled, the mean will
(a) also double
(b) become half
(c) stay the same
(d) become zero
Answer:
(a) also double
Question 4.
The median of a data set is
(a) always equal to the mean.
(b) the middle value when data is sorted.
(c) the smallest value in the set.
(d) the average of all values.
Answer:
(b) the middle value when data is sorted.
Question 5.
Which spreadsheet formula calculates the average of cells B7 to D7?
(a) = MEAN (B7 : D7)
(b) = AVERAGE (B7 : D7)
(c) = SUM (B7 : D7)
(d) = MEDIAN (B7 : D7)
Answer:
(b) = AVERAGE (B7 : D7)
Question 6.
In spreadsheets, B7 refers to
(a) Row B, Column 7
(b) Column B, Row 7
(c) Column 7, Row B
(d) Cell number 7B
Answer:
(b) Column B, Row 7
Question 7.
A line graph is best used to show
(a) static comparisons
(b) data that changes over time
(c) shape of an object
(d) geographical boundaries
Answer:
(b) data that changes over time
Assertion-Reason Questions
Question 1.
Assertion (A) Tripling each observation in a data set makes the new mean three times the original mean.
Reason (R) Mean is affected linearly by multiplication of each observation by a constant.
(a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Answer:
(a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion.
Question 2.
Data set 7, 8,12,16,17, 23, 25, 28.
Assertion (A) Adding the value 29 to the data set will not change the median.
Reason (R) The median depends only on the middle position of ordered data.
(a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.
(c) Assertion is true bus Reason is false.
(d) Assertion is false but Reason is true.
Answer:
(d) Assertion is false but Reason is true.
Fill in the Blanks
1. The mean of 5 numbers 12,14,18, 22, and 24 is _________.
Answer:
18
2. The median of an odd number of observations is found by locating the _________ value in the ordered data.
Answer:
middle
3. If every value in a dataset is decreased by 4, the mean decreases by _________.
Answer:
4
4. Removing a value greater than the current mean makes the mean _________.
Answer:
decrease
5. In spreadsheets, the function used to find the average of cells D2 to DIO is _________.
Answer:
= AVERAGE (D2 : DIO)
6. A line graph typically shows data varying across _________ such as days, months or years.
Answer:
time
7. The maximum temperature of a city in six months is 31, 33, 37,40, 39 and 34 °C. The range of temperatures is _________ °C.
Answer:
9
8. Frequencies in a table tell us how many times a _________ occurs in the data set.
Answer:
value
True/False
Question 1.
The mean represents the “fair-share” interpretation of data.
Answer:
True
Question 2.
Median is affected by extremely large values in the data set.
Answer:
False
Question 3.
In spreadsheets, = SUM (A1: A5) calculates the sum of values in cells A1 to A5.
Answer:
True
Question 4.
A line graph can display more than one data set simultaneously.
Answer:
True
Question 5.
If the median of 7 values is 18 then 18 must be one of the values in the data set.
Answer:
True
Question 6.
Removing a value equal to the median always changes the mean.
Answer:
False
Question 7.
When a line segment in a line graph is steeper, it indicates a quicker change in data.
Answer:
True
Match the Columns
Question 1.
Match the Column A to Column B.
| Column A | Column B |
| (i) Median | (a) Sum + Number of terms |
| (ii) Range | (b) Middle value in ordered data |
| (iii) Mean | (c) Displays variation across time |
| (iv) Line Graph | (d) Highest value – Lowest value |
| (v) Spreadsheet | (e) Uses rows and columns |
Answer:
| Column A | Column B |
| (i) Median | (b) Middle value in ordered data |
| (ii) Range | (d) Highest value – Lowest value |
| (iii) Mean | (a) Sum + Number of terms |
| (iv) Line Graph | (c) Displays variation across time |
| (v) Spreadsheet | (e) Uses rows and columns |