can someone correct this for me.or teach me if i'm wrong
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 need to calculate the average of all four tests.
1. First, add the scores of the first three tests: 75 + 63 + 68 = 206.
2. Let the score Sam must get on the last test be represented by 'x'.
3. Add 'x' to the total score of the first three tests to get the total score in all four tests: 206 + x.
4. To find the average grade, divide the total score by the number of tests (which is 4): (206 + x) / 4.
5. The inequality representing the score Sam must get to obtain a C grade, with an average of 70 or more, is written as: (206 + x) / 4 ≥ 70.
Therefore, the corrected inequality is: (206 + x) / 4 ≥ 70.