The mean of 40 sales receipts is $69.75 and the standard deviation is $10.25. Using Tchebysheff's Theorem, at least 75% of the sales receipts were between $49.25 and $90.25.

Question

Quizplus · Accepted Answer

According to Tchebysheff's Theorem, at least 75% of the data falls within 2 standard deviations of the mean. Therefore, using the formula, we can calculate:
- Lower limit: $69.75 - (2 x $10.25) = $49.25
- Upper limit: $69.75 + (2 x $10.25) = $90.25
Since we know that at least 75% of the data falls within this range, it is true that at least 75% of the sales receipts were between $49.25 and $90.25.

The Mean of 40 Sales Receipts Is $69