Respuesta :

step 1

Find the mean of QB1

mean=(22+20+15+18+19+25+28+15+21+20+25+25+26+26+21+20)/16

mean=346/16

mean=21.625

step 2

Find the mean of QB2

mean=(28+18+21+16+21+25+25+21+28+21+23+19+28+18+21+28)/16

mean=361/16

mean=22.5625

therefore

mean QB2 > mean QB1

answer is the first option