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Me = 10.2/4
= 5
Me = 1/2 *(X₅ + X₆)
= 1/2 * 53
= 26,5
b. Xrata2 = 260/10 = 26
Me = 1/2 * (X₅ + X₆)
= 1/2 (25+28)
= 26,5
c. Merek Durabatt lah yang terbaik