Home
Class 11
MATHS
The variance of 20 observations is 5. If...

The variance of 20 observations is 5. If each observation is multiplied by 2, find the new variance of the resulting observations.

Text Solution

Verified by Experts

The correct Answer is:
`(1)/(20)xx400=20=2^(2)xx5`
Promotional Banner

Topper's Solved these Questions

  • STATISTICS

    NCERT BANGLISH|Exercise EXERCISE 15.1|12 Videos

  • STATISTICS

    NCERT BANGLISH|Exercise EXERCISE 15.2|10 Videos

  • SETS

    NCERT BANGLISH|Exercise MISCELLANEOUS EXERCISE ON CHAPTER 1|26 Videos

  • STRAIGHT LINES

    NCERT BANGLISH|Exercise Miscellaneous Exercise on Chapter 10|24 Videos

Similar Questions

Explore conceptually related problems

The variance of 20 observations is 5. If each observation be multiplied by 2, then find the variance of the resulting observation.

The mean and standard deviation of six observations are 8 and 4, respectively. If each observation is multiplied by 3, find the new mean and new standard deviation of the resulting observations

The standard Deviation of 30 observation of a sample is 4.5 If each observation be subtracted 10, the find the new standard deviation of the resulting observations.

The mean and standard deviation of observations are 8 and 14 respectively. If each observation be multiplied by 3, the find the new and mean and new standard deviation of the resulting observation.

Let sigma be the standard deviation of n observations. Each of the n observation is multiplied by a constant c. Then the standard deviation of the resulting numbers is

The mean of 50 observations is 36. If two observations 30 and 42 are deleted, then mean of the remaining observations is

Find the variance of 1, 2, 3, 4.

If each observation of a raw data whose variance is sigma is multiplied by h, then the variance of the new set is

The mean of n observation is a. If the 1st observation is increased by 1, second by 2 and so on, then new mean is

If each observation of a rew data, whose variance is sigma^2 is multiplied by lambda then the variance of the new set is