Explore topic-wise MCQs in Mathematics Questions and Answers.

This section includes 2 Mcqs, each offering curated multiple-choice questions to sharpen your Mathematics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.	If the standard deviation of the numbers 2, 4, 5 & 6 is a constant a, then find the standard deviation of the numbers 4, 6, 7 & 8.
A.	a + 2
B.	2a
C.	4a
D.	a
Answer» E.

Discussion

2.	The mean of two samples of the sizes 250 and 320 were found to be 20,12 respectively. Their standard deviations were 2 & 5, respectively. Find the variance of combined sample of size 650.
A.	10.23
B.	32.5
C.	65
D.	26.17
Answer» E.

Discussion

Explore topic-wise MCQs in Mathematics Questions and Answers.

If the standard deviation of the numbers 2, 4, 5 & 6 is a constant a, then find the standard deviation of the numbers 4, 6, 7 & 8.

The mean of two samples of the sizes 250 and 320 were found to be 20,12 respectively. Their standard deviations were 2 & 5, respectively. Find the variance of combined sample of size 650.