The ages of a group of 12 people in an Art Class have mean 48. 7 years and standard derivative of 7. 6years. the ages of a group of 7 people in another art class mean is 38.1 and Standard derivative is 4.2 years i)Find the mean age of 19 people ii) the individual ages in years of people in the first art class are denoted by x and those in the second art class by Y. the standard derivation of the whole 19 people
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