Question

According to the US blood bank about 7% of the US has O negative blood if 4 people are chosen at random then what is the probability that no one has O negative blood?Answer the following problems using multiplication rule make sure to reduce your fraction

Answer 1

For each person the probability of he/she having a bloodtype O negative is 7% then the probability of one person having a different blood type is 93%. We want all of them to have a different bloodtype, therefore we need to calculate the product of each to have a different bloodtype.

$p=(\frac{93}{100})^4=0.93^4=0.748$

The probability is 0.748 or 74.8%.