A) an answer that cannot be written as a fraction.
C you just add them divide by 2
You need to use the binomial probability formula:

where:
n = total number of events = 10
k = number of events we are testing = 6
p = probability of event happening = 0.5

= 210×0.015625×0.0625
= 0.205078
Hence, the probability of getting 6 boys out of 10 births is
p = 0.205.
Based on the vertex and table this is the graph.
Take the totally needed to buy it, put the amount you have and then add but substitute for a variable the amount needed.