Question 1169578
n = 1900
p = 0.04
q = 0.96
<pr>
MEAN = np = (1900)(0.04) = 76
SD = {{{sqrt(npq)}}} = {{{sqrt(1900 * 0.04 * 0.96)}}} = {{{sqrt(72.96)}}} = 8.5417
<pr>
P(x ≥ 79) --->  P(x > 79 - 0.5) ---> P(x > 78.5)
<pr>
z = {{{(78.5 - 76)/8.5417}}} = {{{2.5/8.5417}}} = 0.29
<pr>
Looking at a z-table, you will see that there is a 0.6141 probability that fewer than 79 people test positive.  This means there is a 0.3858 probability that 79 or more people ("at least 79") test positive.