The Red Cross regularly conducts Blood Drives throughout the country. They often conduct emergency drives when they are in need of rare blood types. Blood type AB-negative is the rarest type of blood. Only 0.6% of us have this type of blood. Suppose a random sample of 30 blood donors is obtained. What is the probability that at least 2 of them have blood type AB-negative? a. 0.013
b. 0.999
c. 0.986
d. 0.014
e. 0.0008

The probability is    

Step-by-step explanation:

From the question we are told that

     The proportion people with  Blood type AB-negative in the world  is p = 0.006

     The sample size is  n =  30

 Generally the distribution of people with  Blood type  AB-negative  follows a binomial distribution  

i.e  

and the probability distribution function for binomial  distribution is  

Here C stands for combination hence we are going to be making use of the combination function in our calculators  

   Generally the probability that at least 2 of them have blood type AB-negative is mathematically represented as

=>      

=>      

£56

step-by-step explanation:

u divide 24 by 3 and u get 8 so if u do 8 time 7 or 8+8+8+8+8+8+8 u get 56 and 56 divided by 7 is 8.

to find the total number of combinations, multiply the quantity of each item by each other:

2 pairs of shoes x 3 pairs of shorts = 6 different combinations.