On a recent quiz, the class mean was 77 with a standard deviation of 2.4. Calculate...

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Answer 1

Answer #1

x=81,

mean= μ=77

standard deviation=σ =2.4

z=(x-μ) / σ

=( 81-77) /2.4

=4 / 2.4

z =1.67

A data point can be considered unusual if its z-score is above 3 or below -3

here z-score = 1.67 is between -3 & 3

so , it is not unusual

Answer:

z-score = 1.67

not unusual

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Answer 2

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