THE arithmetic mean of a date set is 46 and the standard deviation of the set is 4. which value is exactly 1.5 standard deviations from the arithmetic mean of the set?
A 42 B 44.5 C 47.5 D 50 E 52
第二题 A square countertop has a square tile inlay in the center ,leaving an untiled strip of uniform width around the tile.If the tatio of the tiled area to the untiled area is 25 t 39,which of the following could be the width, in inches, of the strip?
I .1 II. 3 III. 4
A .I only B. II only C.i and iii ONLY D i and ii only E i , ii and iii
第三题
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