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Expert Answer
1.) data frequency(f) X f*X 30-34 14 X = (30+34)/2=32 448 35-39 21 37 777 40-44 14 42 588 45-49 8 47 376 50-54 6 52 312 55-59 7 57 399 60-64 3 62 186 65-69 0 67 0 70-74 2 72 144 ?f = 75 ?fX=3230 mean = ?fX/?f mean = 3230/75 = 43.0667 mean