Home › US High School › Mathematics › Using the Normal Distribution › A normal distribution has a third quartile of 46…
A normal distribution has a third quartile of 46.3 and a first quartile of 27.5. What is the interquartile range?
AIt is 73.8
BIt is 36.9
CIt is 9.4
DIt is 18.8
Answer & Solution
Correct answer: D. It is 18.8
1. The interquartile range is the third quartile minus the first quartile.
2. That is 46.3 minus 27.5.
3. The subtraction gives 18.8.
4. Answering 73.8 adds the quartiles instead of subtracting them.
_Source: OpenStax High School Statistics (CC BY 4.0), Ch 6 "The Normal Distribution", section 6.2 Using the Normal Distribution_
Related questions
To pick out the middle 20 percent of a normal distribution, which two percentiles do you nWhich percentile marks the top of the bottom quartile of a normal distribution?Forty percent of the values in a normal distribution are at least k. Which area do you looThe area to the left of one z-score is 0.9332 and to the left of another is 0.3446. What aExam scores are normal with mean 63 and standard deviation 5. The 90th percentile has a z-To read a probability out of a z-table by hand, what do you work out before opening the taMost z-tables give the area under the normal curve on which side of the z-score?