Measures of Cen...

For the following distribution, find the mean using step deviation method. (Round off your answer to the nearest whole number)

Find the mean mark using step deviation method:

You grew sixty plants using special soil. You measure their lengths and the values are tabulated below.

Length(cm)	$$120-125$$	$$125-130$$	$$130-135$$	$$135-140$$	$$140-145$$	$$145-150$$
Number of plants	$$8$$	$$10$$	Y	$$16$$	$$8$$	$$12$$

The mean length of the plants is $$136$$cm. Find y in the table.

The ages of the $$115$$ people who live on an apartment are grouped as follows$$:$$  The mean length of the plants is $$33.43$$years using direct method. Find y in the table.

Age(years)	Number of people
$$0-10$$	$$10$$
$$10-20$$	$$15$$
$$20-30$$	$$26$$
$$30-40$$	Y
$$40-50$$	$$23$$
$$50-60$$	$$16$$
$$60-70$$	$$3$$
$$70-80$$	$$1$$

Using step deviation method find the mean.

X	20-40	40-60	60-80	80-100
frequency	4	8	12	16

Find the measures of central tendency fro the data set $$2, 4, 5, 1, 7, 2, 3$$.

The measure of central tendency of mean is affected by

If the data set is perfectly normal, the mean, median and mode are _____to each other.

When the mean is the best measure of central tendency?

If the average (arithmetic mean) of $$t$$ and $$(t+2)$$ is $$x$$ and if the average of $$t$$ and $$(t-2)$$ is $$y$$, what is the average of $$x$$ and $$y$$?