Question

Rebecca is training for the swim team tryouts. She plans to swim an average (mean) of 5.5 miles a
week. So far, she has swum 2 miles the first week, 7 miles the second week, 6 miles the third week, 9
miles the fourth week, 5 miles the fifth week, and 3 miles the sixth week. How many miles must she
swim the seventh week, in order to reach her goal of averaging 5.5 miles per week?

Answer 1

Therefore she must swim =6.5 miles the seventh week

Step-by-step explanation:

Given , Rebecca plans to swim an average of 5.5 miles per week.

So, she has swum 2 miles the first week ,7 miles the second week ,6 miles the third week ,9 miles the fourth week ,5 miles the fifth week and 3 miles the sixth week.

Total she has swum =(2+7+6+9+5+3) miles in six week.

                                   =32 miles

To reach her goal she has to swim =(5.5×7)miles= 38.5 miles at the end of seventh week.

Therefore she must swim =(38.5 - 32) miles =6.5 miles the seventh week