It is noted that 8% of kaplan students are left handed. If 20 students are randomly selected, how do you calculate the probability that none of them are left handed?

1 Answer
Nov 15, 2016

Answer:

P(20 right handed students) # =0.18869#

This is a probability of about #18.9%#

Explanation:

P(left handed) = #8% = 0.08#

P(right handed) = 1 - P(left handed) = #1-0.08 = 0.92#

For none of 20 students to be left handed, means they must all be right handed.

#P(R R R R......R R R)" "larr# 20 times

=#0.92 xx 0.92 xx 0.92 xx xx 0.92" "larr# 20 times

=#0.92^20#

=#0.18869#

This is a probability of about #18.9%#