Jebb is the tallest player on the basketball team. He is 1one-half times as tall as the shortest girl in the sixth grade, who is 4one-fourth feet tall. How tall is Jebb?

Jebb is 6 and 1/8 feet tall.

To find out, we need to first convert 4 and 1/4 feet to a fraction, which is 17/4 feet.

Then, we multiply 17/4 by 1 and 1/2 (which is the same as 3/2, as one is the same as two halves) to get:

17/4 * 3/2 = 51/8

So Jebb is 51/8 feet tall, or 6 and 1/8 feet tall when converted to a mixed number.