A 98% confidence interval for a proportion is found to be (0.47, 0.53). What is the sample proportion?
A. 0.50
B. 0.53
C. 0.51
D. 0.49

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.