Here, x = 56
P(x =56) = 72C56 * 0.77^56 *(1-0.77)^16
= 0.1111
yes because normal distribution can be used because
np(1-p)>=10
P(x = 56)
using continuity correction
mean = np = 72*0.77 = 55.44
std.dev = sqrt(npq)
= sqrt(72*0.77*0.23)
= 3.5709
P(x = 56)
= P(x - 0.5 < x < x+0.5)
= P(55.5 < x < 56.5)
= P((55.5 - 55.44)/3.5709 < z < (56.5 - 55.44)/3.5709)
= P(0.0168 <z < 0.2968)
= 0.1100
The exact probability is gretaer than teh approximated by
0.0011
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