Algebraic sum of all the deviation from 30 of 50 observations is 50. Find their mean (A) 20 (B) 30 (C) 80 (D) 31
Complete the variance and standard deviation of the following observations of marks of 5 students of a tutorial group: Marks out of 25:8,12,13,15,22
Find the mean deviation about the mean for the data
|Height of cms||Number of boys|
Calculate the mean and standard deviation for the following data: Wages upto (into Rs.), 15, 30, 45, 60, 75, 90, 105, 120 No. of workers, 12, 30, 65, 107, 157, 202, 222, 230
Find the mean and standard deviation using short-cut method
The length of 40leaves of a plant are measured correct to one millimetre, and the obtained data is represented in the following table:
(i) Draw a histogram to represent the given data. [Hint: First make the class intervals continuous]
(ii) Is there any other suitable graphical representation for the same data?
(iii) Is it correct to conclude that the maximum number of leaves are 153mm long? Why?
Calculate the mean deviation about the mean of the set of first n natural numbers when n is odd natural number.
The mean of 100 numbers observations is 50 and their standards deviation is 5. The sum of all squares of all the observations is (a)50,000 (b) 250,000 (c) 252500 (d) 255000