Homework Help: Statistics

Posted by Susana on Sunday, January 27, 2013 at 5:51pm.

Mrs. Marble gave her 5th grade class a math test. The scores reflect a relatively normal distribution. The mean score for the group was 80 with a standard deviation of 8. Based upon this information, answer the following questions:

Bobby scored exactly two standard deviations above the mean. What was Bobby’s score on the test? __ ___

Statistics - bobpursley, Sunday, January 27, 2013 at 6:01pm
I bet he scored 80+2*8=96
Statistics - Anonymous, Monday, January 28, 2013 at 8:06am
z = (x-u)/S

2 = (x-80)/8

16 = (x-80)

x=96

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