Statistics Test...

Consider the following statements in respect of a histogram:
1. The histogram consists of vertical rectangular bars with a common base such that there is no gap between consecutive bars.
2. The height of the rectangle is determined by the frequency of the class it represents.
Which of the statement given above is/are correct?

The two types of the statistical data are ______ data and secondary data.

The mean of $$48, 27, 36, 24, x$$, and $$2x$$ is $$37.x =$$

The difference in the sales of cellular phones for the years $$1997$$ and $$1999$$ is?

The average of six numbers is 4. If the average of two of those numbers is 2, what is the average of the other four numbers?

On approximately, the number pf days with more than $$70^oF$$ temperature is ____.

The  range of the following data is:
$$84,56,39,45,54,39,56,54,84,21,77,56$$ 

For a collection of $$11$$ items, sum of all items is $$132$$, then the arithmetic mean is.

Find the mean of the first five prime numbers.

The average of five numbers is $$40$$ and the average of another six numbers is $$50$$. The average of all numbers taken together is _______.