What is the missing value, x, in the GFDT?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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 nn psychology students took a standardized test. The scores are summarized in the Grouped Frequency Distribution Table (GFDT) below.

Scores Frequency
100 - 109 17
110 - 119 16
120 - 129 12
130 - 139  x
140 - 149 15
150 - 159 46


The scores are also described in the cumulative table shown below.

Scores Cumulative Frequency
less than 110 17
less than 120 33
less than 130 45
less than 140 59
less than 150 74
less than 160 n


What is the missing value, x, in the GFDT?   

 

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