For what value of k, is the mode of the following data 7 ? 3, 5, 7, 4, 7, 8, 3, 6, 7, 4, k, 3.
If 5 is added to each element of the above data, find the new mode.

The weight (in kg.) of 16 students of a class are given below. Determine the median of the data:

43.8, 61.3, 58.5, 40.0, 51.8, 60.0, 58.5, 62.1, 47.8, 48.2, 55.7, 50.8, 38.8, 54.6, 54.0, 42.5.

365.

Calculate the arithmetic mean of the following frequency distribution:

Class Interval	Frequency
0-30	12
30-60	21
60-90	34
90-120	52
120-150	20
150-180	11

The monthly income (in rupees) of 18 workers in a factory are given below. Find the median of the data :

2500, 2100, 4050, 3275, 2427, 1890, 3750, 4500, 2500, 2970, 3800, 4360, 2225, 3000, 1975, 3650, 4200, 3050.

The weight (is cm) of 12 students of a class are given below. Determine the median of the data : 158.5, 139.6, 161.2, 138.8, 159.0, 142.6, 156.1, 143.8, 160.0, 144.2, 160.2, 145.1.

Calculate the arithmetic mean of the following distribution: