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Find the mean and variance for the following frequency distrib
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Find the mean and variance for the following frequency distributions :

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Practice questions from similar books

Question 1
The length of leaves 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 long? Why?

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Question 2
The mean and standard deviation of five observations and are 10 and 3 respectively, then variance of the observation is equal to (a) 437.5 (b) 507.5 (c) 537.5 (d) 487.5

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Question 3
Mean and variance of five observations are and respectively. If three of these observations are then find absolute difference between the other two observations (A) (B) (C) (D)

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Question 4
Let be n observations, and let be their arithematic mean and be their variance.Statement 1: Variance of .Statement 2: Arithmetic mean of .

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Question Text
Find the mean and variance for the following frequency distributions :