Natasha records the price for a gallon of home-heating oil from 20 randomly selected providers in her region on May 15. She does

Question

Natasha records the price for a gallon of home-heating oil from 20 randomly selected providers in her region on May 15.
She does it again with another 20 randomly selected providers on November 15. The results (in dollars) are shown in the
accompanying samples. Each date had one provider that had a price of $2.879 per gallon. Is the $2.879 price per gallon
more unusual to occur on May 15 or November 15?
Use Excel to calculate the z-scores for a price of $2.879 on May 15 and on November 15, rounding to two decimal places.
Provide your answer below:
May 15 z-score:
November 15 z-score:
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15-May
2.849
2.839
2.859
2.699
2.759
2.889
2.789
2.739
2.789
15-Nov
3.069
3.109
2.879
2.959
3.069
3.049
3.089
2.929
2.909
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