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Do Secure https://www.mathxl.com/Student/PlayerHomework aspx?homeworkld 469694767&questionld; 5&flushed-false;&cld; 4893604 MATH 1530 R80 Spring 2018 LaVora Young&1 3/11/18 8:21 AM Homework: Chapter 6.2 Homework Score: 0 of 1 pt 6.2.18-T HW Score: 47.95%, 6.23 of 13 pts s have IQ scores that are normaly distributed with a mean of 99 5 and a standard deviation 17.2 Find the first quartile O,. which is the 1Q score separating the bottom 25% from the top 75% (Hint. Draw a graph) Type an integer or

Explanation / Answer

GIven

Mean = 99.5 standard deviation = 17.2

For the 1st quartile range i.e bottom 25% the Z score from standard normal distribution table is -0.675

Z = (X-U)/Sd

-0.675 = (X - 99.5)17.2

17.2*-0.675 = (X- 99.5)

-11.61+99.5 = X

X = 87.89

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