The following table gives the distribution of the life time of 400 neon lamps :

Find the median life time of a lamp

The following table gives the life times of 400 neon lamps : (ii) How many lamps have a life time of more than 700 hours ?

The following table gives the life times of 400 neon lamps : (i) Represent the given information with the help of a histogram.

The following table gives the life time of 200 bulbs. Calculate the mean life time of a bulb by step deviation method :

The following distribution gives the distribution of life times of washing machines of a certain company: Convert the above distribution into 'less than type' and draw its ogive.

In the following frequency distribution, find the median class.

The following table gives the dally income of 80 workers of a factory. Find mean median and mode for the given data

From the following frequency distribution, find the median class

The distribution below gives the weights of 30 students of a class. Find the median weight of the students .

The following table give marks of students in a test. The frequency of class 49-52 is missing. The mean of the given distribution is 47.2. Find the missing frequency.

The following table gives the life time in days of 100 bulbs: Change the above distribution as frequency distribution.