Given the height (in cm) of 10 persons , calculate standard deviation and coefficient of variation :
170 , 165 , 150 , 154 , 163 , 169 , 155 , 153 , 164 , 168

Given the marks of ten students , calculate standard deviation and coefficient of variation : 70 , 80 , 90 , 85 , 65 , 55 , 75 , 84 , 97 , 59

If standard deviation of a given data is 5 and mean is 50 then coefficient of variation (C.V) is equal to A) 100 B) 0 C) 1 D) 10

If standard deviation of a given data is 5 and mean is 50 then coefficient of variation (C.V) is equal to a)100 b)0 c)1 d) 10

Heights (in cm) of 25 children are given below: 168, 165, 163, 160, 163, 161, 162, 164, 163, 162, 164, 163, 160, 163, 160, 165, 163, 162, 163, 164, 163, 160, 165, 163, 162 What is the mode of their heights? What do we understand by mode here?

The heights of 50 students, measured to the nearest centimetres, have been found to be as follows: 161 150 154 165 168 161 154 162 150 151 162 164 171 165 158 154 156 172 160 170 153 159 161 170 162 165 166 168 165 164 154 152 153 156 158 162 160 161 173 166 161 159 162 167 168 159 158 153 154 159 What can you conclude about their heights from the table?

The heights of 50 students , measured to the nearest centimetres, have been found to be as follows : {:(161,150,154,165,168,161,154,162,150,151),(162,164,171,165,158,154,156,172,160,170),(153,159,161,170,162,165,166,168,165,164),(154,152,153,156,158,162,160,161,173,166),(161,159,162,167,168,159,158,153,154,159):} (i) Represent the data given above by a grouped frequency distribution table, taking the class intervals as 160-165,165-170 ,etc.

The heights of 50 students, measured to the nearest centimetres, have been found to be as follows: 161 150 154 165 168 161 154 162 150 151 162 164 171 165 158 154 156 172 160 170 153 159 161 170 162 165 166 168 165 164 154 152 153 156 158 162 160 161 173 166 161 159 162 167 168 159 158 153 154 159 Represent the data given above by a grouped frequency distribution table, taking the class intervals as 160-165, 165-170, etc.

The heights, to the nearest cm, of 30 men are given below: {:(159, 170, 174, 173, 175, 160, 161, 164, 163, 165), (164, 171, 162, 170, 177, 185, 181, 180, 175, 165), (186, 174, 168, 168, 176, 176, 165, 175, 167, 180):} Using class intervals 155 - 160, 160 - 165, ... draw up a grouped frequency distribution and use this to estimate the Arithmetic mean and standard deviation.