The lengths of great white sharks follow a normal
distribution. It is assumed that the average length is 22 feet.

A sample of 9 great white sharks caught off the coast of Australia averaged 24 feet with a standard deviation of 3 feet. The calculated statistic (24−22) /(3 sq. r. 9)

A) follows a z distribution with 10 degrees of freedom.
B) follows a t distribution with 10 degrees of freedom.
C) follows a z distribution with 8 degrees of freedom.
D) follows a t distribution with 8 degrees of freedom.