Assume that adults have IQ scores that normally distributed with a mean of 99.2 and a standard deviation of 24.2. Find the first quartile Q1. Which is the IQ score separating the bottom 25% from the top 75%. ( hint . Draw a graph ). The first quartile is ____ ( type an integer or decimal rounded to one decimal place as needed .)

Assume that adults have IQ scores that normally distributed with a mean of 99.2 and a standard deviation of 24.2. Find the first quartile Q1. Which is the IQ score separating the bottom 25% from the top 75%. ( hint . Draw a graph ). The first quartile is ____ ( type an integer or decimal rounded to one decimal place as needed .)

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.5: Comparing Sets Of Data

Problem 14PPS

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Question

The first quartile is ____ ( type an integer or decimal rounded to one decimal place as needed .)

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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