If X, the Time (In Minutes)to Complete an Oil Change $\le$

question 7

Multiple Choice

If x, the time (in minutes) to complete an oil change job at certain auto service station, is uniformly distributed over the interval 20 to 30, inclusively (20 $\le$ x $\le$ 30) , then the mean of this distribution is __________________.

• A)50
• B)25
• C)10
• D)15
• E)5

---

Definitions:

Notochord

A flexible rod made out of a material similar to cartilage that provides support in the embryonic stages of all chordates and some adult animals.

Phylum

A major category in the classification of living organisms, ranking above class and below kingdom.

Characteristic

A distinguishing feature or quality that defines or identifies something.

Echinoderms

A phylum of marine animals that includes starfish, sea urchins, sea cucumbers, and sand dollars, characterized by radial symmetry and a unique water vascular system.