The mean of 100 observations is 50 and the standard deviation is 10. If 5 is subtracted from each observation and then it is divided by 4, then what will be the new mean and the new standard deviation respectively
45, 5
11.25, 1.25
11.25, 2.5
12.5, 2.5
In eight throws of a die, 5 or 6 is considered a success.The mean and standard deviation of total number of successes is respectively given by :
Let the correlation coefficient between X and Y be 0.6. Random variables Z and W are defined as Z = X + 5 and W = . What is the correlation coefficient between Z and W ?
0.1
0.2
0.36
0.6
If all the natural numbers between 1 and 20 are multiplied by 3, then what is the variance of the resulting series ?
99.75
199.75
299.25
399.25
If the correlation coefficient between x and y is 0.6, covariance is 27 and variance of y is 25, then what is the variance of x ?
9
81
Consider the following statements :
1 only
2 only
Both 1 and 2
Neither 1 nor 2
Consider the following statements :
1 only
2 only
Both 1 and 2
Neither 1 nor 2
C.
Both 1 and 2
What is the median of the numbers
4.6, 0, 9.3, - 4.8, 7.6, 2.3, 12.7, 3.5, 8.2, 6.1, 3.9, 5.2 ?
3.8
4.9
5.7
6.0
In a test in Mathematics, 20% of the students obtained "first class". If the data are represented by a Pie-Chart, what is the central angle corresponding to "first class" ?