Question

A fair coin is tossed 21 times. What is the probability that at most 18 heads occur?

a) 0.00063419

b) 0.01074482

c) 0.99988937

d) 0.99925518

e) 0.00011063

An urn contains 11 white balls and 9 green balls. A sample of seven is selected at random. What is the probability that the sample contains at least one green ball?

a) 0.946362

b) 0.995743

c) 0.999884

d) 0.053638

e) 0.000116

A classroom of children has 10 boys and 16 girls in which five students are chosen to do presentations. What is the probability that more boys than girls are chosen?

a) 0.0511

b) 0.2227

c) 0.2738

d) 0.0038

e) 0.2700

Answer 1

Salauton om 13x 21-オ b,厂 -0.00011063 10: 9998893ート option (s) ニ

east ome gen cohile bal 2 0 C うoption t oc.6 10 1c 26Cs 26 C