Answer: A bag can weigh 13.77 ounces and not need to be repacked.
Step-by-step explanation:
Since we have given that
Mean = 12.08 ounces
Standard deviation = 1.03 ounces
Bags in the upper 5% are too heavy and must be repackaged.
Using the standard normal table.
z = 1.645
So,
Hence, A bag can weigh 13.77 ounces and not need to be repacked.
Answer:
y=4
Step-by-step explanation:
needs to be 20 characters looong lol
Answer:
Step-by-step explanation:
A) Let x = first score and y = second score
E[x] = 20.9 and E[y] = 20.9
E[x-y] = E[x] – E[y] = 20.9 – 20.9 = 0
b) Standard deviation
= Var[x-y] = Var[x] + Var [y]
= 4.8^2 + 4.8^2 = 46.08
SD[x-y] = sqrt(Var[x-y])
= sqrt(46.08)
= 6.8
c) Z = +/- (mean-x)/SD = +- (0-6)/6.8 = +/- 0.88
From Z table: P(Z<-0.88 or Z>0.88)
= 2*P(Z>0.88)
= 2*0.1894
= 0.3788