The following table shows the weights (in kg) of 15 workers in a factory. Weight in kg 60 63 66 72 75 Number of workers 4 5 3 1 2 Calculate the mean weight.

Given; The weight of 15 workers in a factory. M e a n w e i g h t = Σ ( f i × x i ) Σ f i Mean weight = 975 15 Mean weight = 65 k g Hence, the mean is 65 k g .

The daily wages (in rupees) of 60 workers in a factory are given below: Daily wages (in ₹ ) 280 300 320 360 380 Number of workers 14 16 15 7 8 Calculate the mean of daily wages.

Given: Daily wages of a worker in a factory. Mean daily wages = Σ ( f i × x i ) Σf i Mean of daily wages = 19080 60 Mean of daily wages = 318 Hence, the mean is 318

The heights (in cm) of 90 plants in a garden are given below: Height (in cm) 58 60 62 64 66 74 Number of plants 20 25 15 8 12 10 Find the mean height.

Given, heights of plants in a garden. Height (in cm) x i 58 60 62 64 66 74 Number of plants f i 20 25 15 8 12 10 f i x i 1160 1500 930 512 792 740 Mean height = Σ ( f i × x i ) Σf i Mean height = 5634 90 Mean height = 62 . 6 cm Hence, the mean is 62 . 6 c m

The ages (in years) of 50 players of a school are given below: Age (in years) 14 15 16 17 18 Numbers of players 15 14 10 8 3 Find the mean age.

Given, the ages of players. Age (in years) x i 14 15 16 17 18 Numbers of players f i 15 14 10 8 3 x i f i 210 210 160 136 54 Mean age = Σ ( f i × x i ) Σf i Mean of age = 770 50 Mean = 15 . 4 Hence, the mean is 15 . 4 years.

The heights (in cm ) of 40 boys were measured and recorded and under: Height (in cm) 165 170 175 180 Number of boys 9 8 11 12 Find the mean height.

Given, height of boys. Height (in cm) x i 165 170 175 180 Number of boys f i 9 8 11 12 x i f i 1485 1360 1925 2160 Mean height = Σ ( f i × x i ) Σf i Mean height = 6930 40 Mean height = 173 . 25 c m Hence, the mean is 173 . 25 c m .