AP Statistics· difficulty 2/5
Hypothesized distribution: 40% A, 30% B, 20% C, 10% D. Sample size n = 250.
What are the expected counts?
125, 75, 25, 25
62.5, 62.5, 62.5, 62.5
100, 75, 50, 25
40, 30, 20, 10
Explanation
E_i = n × p_i. So 250×0.40=100, 250×0.30=75, 250×0.20=50, 250×0.10=25.
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