题目

Do you think you’re smarter than your parents and grandparents? According to James Flynn, a professor at a New Zealand university, you are! Over the course of the last century, people who have taken IQ tests have gotten increasingly better scores---on average, three points better for every decade that has passed. This improvement is known as “the Flynn effect”, and scientists want to know what is behind it.IQ tests and other similar tests are designed to measure general intelligence rather than knowledge. Flynn knew that intelligence is partly inherited from our parents and partly the re 某校对1 200名女生的身高进行了测量，身高在1.58～1.63(单位：m)这一小组的频率为0.25，则该组的人数为 [　　] A．150人 B．300人 C．600人 D．900人