Bones Brothers & Associates prepare individual tax returns. Over prior years, Bones Brothers has maintained careful records regarding the time to prepare a return. The mean time to prepare a return is 90 minutes, and the population standard deviation of this distribution is 16 minutes. Suppose 140 returns from this year are selected and analyzed regarding the preparation time. What is the probability that the mean time for the sample of 140 returns is between 88 minutes and 92 minutes

• 0.8612
• 0.8476
• 0.1594
• Approximately 1

Bones Brothers & Associates prepare individual tax returns. Over prior years, Bones Brothers has maintained careful records regarding the time to prepare a return. The mean time to prepare a return is 90 minutes, and the population standard deviation of this distribution is 15 minutes. Suppose 120 returns from this year are selected and analyzed regarding the preparation time. What is the probability that the mean time for the sample of 120 returns for this year is greater than 92?

• Approximately 0
• 0.4211
• 0.0789
• 0.0721