What is a good score on the ACT for a 10th grader?
The average score for a 10th grader that takes the ACT exam is 18.A sample of 300 jellybeans was removed from a barrel of jellybeans. All of the jellybeans in the barrel are one of four colors: red, orange, green, and purple. For the sample, the number of jellybeans of each color is shown in the table below.
| Color | Number of jellybeans |
| red | 75 |
（B） 8
（C） 4 
（D） 6 
（E） 18
when x= 
?