On the past math summative exam the bottom 20% of students failed to pass the test.the mean for the test was 55 and the standard deviation was 11. What was the passing score

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
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On the past math summative exam the bottom 20% of students failed to pass the test.the mean for the test was 55 and the standard deviation was 11. What was the passing score 

 

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