In a congressional district, 55% of the registered voters are Democrats. Which of the following is equivalent to the probability of getting less than 50%

Democrats in a random sample of size 100?

(a) PaZ <

0.50 − 0.55 100 b

(b) P

£

Z <

0.50 − 0.55

Å

0.55(0.45)

100

≥

(c) P

£

Z <

0.55 − 0.50

Å

0.55(0.45)

100

≥

(d) PaZ <

0.50 − 0.55

!100(0.55)(0.45)

b

(e) PaZ <

0.55 − 0.50

!100(0.55)(0.45)

b