Question

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 266.8-cm and a standard deviation of 1.1-cm. For shipment, 39 steel rods are bundled together. Round all answers to four decimal places if necessary. a. What is the distribution of X? X ~ N( 266.8, 1.1 ) b. What is the distribution of x?? x? ~ N( 266.8, 0.1761 ) c. For a single randomly selected steel rod, find the probability that the length is between 266.9-cm and 267.2-cm. d. For a bundled of 39 rods, find the probability that the average length is between 266.9-cm and 267.2-cm. e. For part d), is the assumption of normal necessary? No Yes

          A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 266.8-cm and a standard deviation of 1.1-cm. For shipment, 39 steel rods are bundled together. Round all answers to four decimal places if necessary.

a. What is the distribution of X? X ~ N( 266.8, 1.1 )

b. What is the distribution of x?? x? ~ N( 266.8, 0.1761 )

c. For a single randomly selected steel rod, find the probability that the length is between 266.9-cm and 267.2-cm.

d. For a bundled of 39 rods, find the probability that the average length is between 266.9-cm and 267.2-cm.

e. For part d), is the assumption of normal necessary? No Yes

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 266.8-cm and a standard deviation of 1.1-cm. For shipment, 39 steel rods are bundled together. Round all answers to four decimal places if necessary.

a. What is the distribution of X? X N( 266.8, 1.1 )

b. What is the distribution of x?? x? N( 266.8, 0.1761 )

c. For a single randomly selected steel rod, find the probability that the length is between 266.9-cm and 267.2-cm.

d. For a bundled of 39 rods, find the probability that the average length is between 266.9-cm and 267.2-cm.

e. For part d), is the assumption of normal necessary? No Yes

Added by Mary D.

Question

Please give Ace some feedback