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What is the value of that z-score

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The sales data for January and February of a frozen yogurt shop are approximately normal.

The mean daily sales for January was $300 with a standard deviation of $20. On the 15th of January, the shop sold $310 of yogurt.

The mean daily sales for February was $320 with a standard deviation of $50. On the 15th of February, the shop sold $340 of yogurt.

Which month had a higher z-score for sales on the 15th, and what is the value of that z-score?

Reference no: EM132852685

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