Find the mean of the following observations: 20, 30, 40 and 50

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Find the mean of the following data, using direct method:
$\begin{matrix} Class & 0 - 10 & 10 - 20 & 20 - 30 & 30 - 40 & 40 - 50 & 50 - 60 Frequency & 7 & 5 & 6 & 12 & 8 & 2 \end{matrix}$

Q. Find the mean of the following observations: 20, 30, 40 and 50

Q. The mean and variance of 7 observations are 8 and 16, respectively. If 5 of the observations are 2, 4, 10, 12, 14, find the remaining 2 observations.

Or

Calculate the mean deviation about the mean of the following data.

\begin{matrix} Classes & 10 - 20 & 20 - 30 & 30 - 40 & 40 - 50 & 50 - 60 & 60 - 70 & 70 - 80 Frequency & 2 & 3 & 8 & 14 & 8 & 3 & 2 \end{matrix}

Q. A scientist conducted a research and got the observations:

20, 30, 50, 20, 40

and

80

. Find the sum of the deviations of the observations from their mean.

Q. Find the mean of the following data

Classes	0 -10	10-20	20 - 30	30 - 40	40 - 50
Frequency	18	17	22	24	19

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