Q1. Choose the correct answer -
1. The most frequently occurring observation:
a. mode b. Median c. Mean d. None of these
2. Find the surface area of a sphere of radius = 7 :
a. 516 b. 517 c. 616 d. 617
3. The value of polynomial 5x – 4x2 + 3 when x= -1 is :
a. – 6 b. 6 c. 2 d. -2
4. a
m x an =
a. a
m+n b. a
m - n
c. a
m / n d. am *n
5. Each angle of an equilateral triangle is of :
a. 900 b. 600
c. 1200 b. 1800
Answers
ANSWER:
The following are some drawbacks of the median:
i. Not based on all observations: The median being the middlemost value is not based on all observations. It is said to be a positional average and hence is not dependent on all values.
ii. Essential array: To calculate the median, it is essential to form an array first. However, if a series is lengthy, then the array is difficult to form.
iii. Ignores extreme values: The median ignores extreme values; thus, it is less useful in cases where large weights are assigned to extreme values.
iv. Faulty representative: Because the median ignores extreme values and is not based on all observations, it is not a true representative of the series.
Page No 103:
Question 4.4:
Write answers for the following questions
Write merits and demerits of range.
ANSWER:
The range is defined as the difference between the smallest and largest values of a given set of distribution. The following are the merits and demerits of the range:
Merits