The average labor time to sew a pair of denim jeans is 4.2 hours with a standard deviation of 30 minutes.If the distribution is normal,then the probability of a worker finishing a pair of jeans in less than 3.5 hours is:
A) 0.0808.
B) 0.4192.
C) 0.5808.
D) 0.9192.
E) 0.9808.

Question

Quizplus · Accepted Answer

To find the probability, we first calculate the z-score: z = (3.5 - 4.2) / 0.5 = -1.4. Using the standard normal distribution table, a z-score of -1.4 corresponds to a probability of approximately 0.0808.

The Average Labor Time to Sew a Pair of Denim