can someone correct this for me please.
Statistics. Sam must have an average of 70 or more in his summer course to obtain a grade of C. His first three test grades were 75,63, and 68. Write an inequality representing the score that Sam must get on the last test to get a C grade.
Total marks in 3 test 75+63+68 >= 206
Let score in the last test = x
Total score in 4 test = 206 + x
Average in 4 test = A >=(206 + x) / 4
A>= 70
To find the inequality representing the score that Sam must get on the last test to get a C grade, we can follow these steps:
1. Calculate the sum of Sam's first three test grades: 75 + 63 + 68 = 206.
2. Since Sam must have an average of 70 or more to obtain a grade of C, we can set up the following inequality: (206 + x) / 4 ≥ 70.
Explanation for step 2:
- The total score in the 4 tests is the sum of the first three test grades (206) plus the score on the last test (x): 206 + x.
- To get the average, we divide the total score by the number of tests: (206 + x) / 4.
- Since the average must be at least 70 for a grade of C, we can write the inequality: (206 + x) / 4 ≥ 70.
Therefore, the inequality representing the score that Sam must get on the last test to get a C grade is:
(206 + x) / 4 ≥ 70.