the table below shows the frequency of marks obtained by 40 students in a test marks:5,6,7,8,9,10 frequency: 8,x-1,x,10,6,5 if a student is selected at random, find the probability that he scored 6marks

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.