A Frequency Distribution Has a Mean of 100 and a Standard

question 55

Multiple Choice

A frequency distribution has a mean of 100 and a standard deviation of 20. The class limits for one class are 50 up to 60. What are the standard normal z-statistics for the class limits?

• A)−20 and 20
• B)−2.5 and −2.0
• C)2.0 and 2.5
• D)−50 and −40

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