MCQ 2511 Mark
Which one of the following is not a measure of central value?
- AMean
- BMode
- CMedian
- ✓Range
Answer
View full question & answer→Correct option: D.
Range
We know that mean, median and mode are all measures of central tendency.
Questions · Page 6 of 6
M.C.Q
MCQ 2521 Mark
$\text{Mode}+\frac{3}{2}(\text{Median - Mode})=$
- AMode
- BMedian
- CNone of these
- ✓Mean
Answer
View full question & answer→Correct option: D.
Mean
$3$ Median = $2$ Mean + Mode
$\Rightarrow 3$ Median – Mode = $2$ Mean
$\Rightarrow\text{Mean}=\frac{3}{2}\text{ Median }-\frac{\text{Mode}}{2}$
$\Rightarrow\text{Mean}+\frac{3}{2}\text{ Median }-\frac{\text{Mode}}{2}-\text{Mode = Mean}$
$\Rightarrow\text{Mean}+\frac{3}{2}\text{(Median - }\text{Mode) = Mean}$
MCQ 2531 Mark
The minimum value of a data is $82$ and range is $38$, then the maximum value is:
- ✓$120$
- B$60$
- C$82$
- D$76$
Answer
View full question & answer→Correct option: A.
$120$
The difference between the maximum and minimum value of the observation is called a range.
Let the maximum value be $x$.
So,
$x - 82 = 38$
$x = 82 + 38$
$x = 120$
Let the maximum value be $x$.
So,
$x - 82 = 38$
$x = 82 + 38$
$x = 120$
MCQ 2541 Mark
The mean of the below frequency distribution is $3.5$, then the value of $x$ is:
|
Varible
|
$1$
|
$2$
|
$x$
|
$4$
|
$5$
|
|
Frequency
|
$2$
|
$3$
|
$4$
|
$5$
|
$6$
|
- A$2$
- B$4$
- C$5$
- ✓$3$
Answer
View full question & answer→Correct option: D.
$3$
From the given frequency distribution table:
$3.5=\frac{2\times1+3\times2+4\text{x}+5\times4+6\times5}{2+3+4+5+6}$
$3.5=\frac{2+6+4\text{x}+20+30}{20}$
$70 + 4x + 58$
$4x = 12$
$x = 3$
MCQ 2551 Mark
In the given graph, the number of students who scored $60$ or more marks is:
- A$19$
- B$20$
- ✓$21$
- D$22$
Answer
View full question & answer→Correct option: C.
$21$
Add the values corresponding to the height of the bar from $60$ to $100$
$10 + 5 + 3 + 3 = 21$
$10 + 5 + 3 + 3 = 21$
MCQ 2561 Mark
The class mark of the class interval $2.4-6.6$ is:
- ✓$4.5$
- B$4.2$
- C$6.6$
- D$2.4$
Answer
View full question & answer→Correct option: A.
$4.5$
Class mark $=\frac{\text{uppar limit+lower limit}}{2}$
$=\frac{2.4+6.6}{2}$
$=\frac{9}{2}$
$=\frac{2.4+6.6}{2}$
$=\frac{9}{2}$
MCQ 2571 Mark
The mean of the marks scored by $50$ students was found to be $39$. Later on it was discovered that a score of $43$ was misread as $23$. The correct mean is:
- ✓$39.4$
- B$39.8$
- C$39.2$
- D$38.6$
Answer
View full question & answer→Correct option: A.
$39.4$
Mean of the marks scored by $50$ students $= 39$
Sum of the marks scored by $50$ students $= (39 \times 50) = 1950$
Correct sum $= (1950 + 43 - 23) = 1970$
$\therefore$ Mean $= 19750 = 39.4$
Sum of the marks scored by $50$ students $= (39 \times 50) = 1950$
Correct sum $= (1950 + 43 - 23) = 1970$
$\therefore$ Mean $= 19750 = 39.4$