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

How many times is a kg heavier than a mg?

The following table gives the weight of 120 articles: Change the distribution to a 'more than type' distribution and draw its ogive.

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.

How many times more intense is a 60 dB sound than a 30 dB sound ?

In each of the following, give the justification of the construction too. Draw a right-triangle in which the sides (other than hypotenuse) are of lengths 4 cm and 3 cm. Then, construct another triangle whose sides are (5)/(3) times the corresponding sides of the given triangle.