Question 1150407
n = 600
p = 0.08
q = 0.92
<pr>
M = np = 600(0.08) = 48
<pr>
SD = {{{sqrt(n*p*q)}}} = {{{sqrt(600(0.08)(0.92))}}} = {{{sqrt(44.16)}}} = 6.645
<pr>
P(x < 40) ----> P(x < 39.5)
<pr>
z = {{{(39.5 - M)/SD}}} = {{{(39.5 - 48)/6.645)}}} = {{{(-8.5)/6.645}}} = -1.28
<pr>
Look up -1.28 on a z-table.  The result is 0.1003.  This means there is a 0.1003 probability of fewer than 40 sales.