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In the data set below, what are the lower quartile, the median, and the upper quartile? $\newline$ $18, 18, 24, 27, 29, 35, 40, 55, 83, 86, 98$ $\newline$ lower quartile $=$ $\_\_$ $\newline$ median $=$ $\_\_$ $\newline$ upper quartile $=$ $\_\_$

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Calculate quartiles and interquartile range

Full solution

Q. In the data set below, what are the lower quartile, the median, and the upper quartile?

\newline

18, 18, 24, 27, 29, 35, 40, 55, 83, 86, 98

\newline

lower quartile

=

\_\_

\newline

median

=

\_\_

\newline

upper quartile

=

\_\_

Identify Median: Step $1$ : Identify the median of the data set. $\newline$ Data set: $18, 18, 24, 27, 29, 35, 40, 55, 83, 86, 98$ . $\newline$ Since there are $11$ numbers, the median is the $6$ th number. $\newline$ Calculation: Median $= 35$
Identify Lower Quartile: Step $2$ : Identify the lower quartile. $\newline$ For the lower quartile, consider the first half of the data set, excluding the median. $\newline$ Data for lower quartile: $18$ , $18$ , $24$ , $27$ , $29$ . $\newline$ Since there are $5$ numbers, the lower quartile is the $3$ rd number. $\newline$ Calculation: Lower quartile $= 24$
Identify Upper Quartile: Step $3$ : Identify the upper quartile. $\newline$ For the upper quartile, consider the second half of the data set, excluding the median. $\newline$ Data for upper quartile: $40$ , $55$ , $83$ , $86$ , $98$ . $\newline$ Since there are $5$ numbers, the upper quartile is the $3$ rd number. $\newline$ Calculation: Upper quartile $= 83$

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