Question: Dispersion : Problems: Ref: Ramakrishna Pillai's Textbook of complementary statistics. 1. The numbers examined, mean weight, and the SD in each of two groups

Dispersion : Problems: Ref: Ramakrishna Pillai's Textbook of complementary statistics. 1. The

Dispersion : Problems: Ref: Ramakrishna Pillai's Textbook of complementary statistics. 1. The numbers examined, mean weight, and the SD in each of two groups of students are given below. Find the mean weight and SD of both the groups taken together. Group 1. Group 2. 58kg 67kg Mean (Xi) SD (S.) No. of students (ni) 6kg 50 5 kg 60.

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