Answer:
4.20
Step-by-step explanation:
Given data:
the average increase in sales 'x' = 18
ad campaign will increase sales for a fast-food chain 'μ'= 15
standard deviation 'σ'= 5
random sample of stores 'n'=49
In order to determine z-value, we use the formula i.e
z=( x-μ ) / (σ/ )
z=( 18-15) / (5/ )
z= 3/ 0.714
z= 4.20
f(1) = 7
f(2) = 18
f(3) = 31
f(4) = 46
f(5) = 63
f(6) = 82
f(7) = 103
f(8) = 126
f(9) = 151
f(10) = 178
f(1) = (-1)^2+8(1)-2 = 7
Continue plugging in values...
60
Slightly to left of 5.
y=x*7
63=9*7
28=4*7
14=2*7
77=11*7