Question

The weights (in kg) of 50 wild animals of a National Park were recorded and the following data was obtained: | Weight (in kg) | Number of animals | |----------------|-------------------| | 100-110 | 4 | | 110-120 | 12 | | 120-130 | 23 | | 130-140 | 8 | | 140-150 | 3 | Find the mean weight (in kg) of animals, using assumed mean method.

In the formula x̄ = a + (Σfᵢdᵢ)/(Σfᵢ) for finding the mean of grouped data, dᵢ is the:

Find the value of Σfᵢdᵢ if the mean is 25, the assumed mean is 20 and Σfᵢ = 40.

Find the mean of the following data using the assumed mean method: | Class | 10–25 | 25–40 | 40–55 | 55–70 | 70–85 | 85–100 | | Frequency | 2 | 3 | 7 | 6 | 6 | 6 |