Statistics Test...

Find the arithmetic mean of numbers from $$1$$ to $$9$$.

Mean of $$9$$ observations was founded to be $$35$$. Later on, it was detected that an observation $$81$$ was misread as $$18$$, then the correct mean of the observations is ____________.

Primary data in statistics is the data collected from : 

The given bar graph shows the number of matches played by different teams. Read the bar graph and answer the questions:
How many matches did both India and Bangladesh play?

The mean of $$\displaystyle\frac{1}{3},\frac{3}{4},\frac{5}{6},\frac{1}{2}$$ and $$\displaystyle\frac{7}{12}$$ is ____________.

Length of the class $$11-20$$ is ______.

What temperature does the given thermometer shows?

In a frequency distribution with classes $$(1-8),(9-16),(17-24).... $$the class interval is 

The mean weight of 9 students is 25 kg. If one more student is joined in the group the mean is unaltered, then the weight of the 10th student is

The sum of $$15$$ observations is $$434+x.$$ If the mean of the data is $$x,$$ then find $$x.$$