1. The A.M of 7, 8 and 9 with frequencies p, q and r respectively is 12. What is the A.M if the
frequencies are changed to 2p, 24 and 2r respectively?
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Step-by-step explanation:
Mean = Sum of data ÷ Cumulative Frequency
Sum =6×4+4×2+8×5+3×1=75
∴ Mean =
12
75
=6.25
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