the normal distribution is symmetric about its mean.
so answer c) must be true.
the holiday party will cost $800 if 40 people attend.
first we need to find how much it costs per person.
we know it costs $20 per person so we can calculate how much it costs for 40 people.
2*1 = 2^1
2*2 = 2^2
the answers are
x = 1 and x = 2