Measures of Cen...

The number of trees in different parks of a city are $$33, 38, 48, 33, 34, 33$$ and $$24$$. The mode of this data is _______.

The mean age of $$25$$ students in a class is $$12$$. If the teacher's age is included, the mean age increases by $$1$$. Then teacher's age (in years) is:

The average life expectancy in three countries $$A,B $$ and $$C$$ was $$75,90$$ and $$80$$ years respectively. The ratio of population in the three countries wa $$4:2:3$$ respectively. What was the average life expectancy of the three countries combined?

If a variable takes the discrete values $$\alpha +4,\alpha -\cfrac{7}{2},\alpha -\cfrac{5}{2},\alpha -3,\alpha -2,\alpha +\cfrac{1}{2},\alpha -\cfrac{1}{2},\alpha +5(\alpha > 0)$$ then the median is

Find the mode of the following data:
$$90, 40, 68, 90, 50, 60$$

Most frequently occuring values of a set of observation

A school has four sections of chemistry in class XII having $$40, 35, 45$$ and $$42$$ students. The mean marks obtained in Chemistry test are $$50, 60, 55$$ and $$45$$ respectively for the four sections. The overall average of marks per students is -

7 kg of tea costing Rs. 280 per kg is mixed with 9 kg of tea costing Rs. 240 per kg. The average price per kg of the mixed tea is:

A car owner buys petrol at Rs. $$7.50$$, Rs. $$8$$ and Rs. $$8.50$$ per litre for three consecutive years. What approximately is the average cost per litre if he spends Rs. $$4000$$ each year?

Find the median of the data $$a,ar,ar^{2}$$,......$$ar^{n}$$ where $$n$$ is an odd number.