Blood type ab is the rarest blood type, occurring in only 4% of the population in the united states. in australia, only 1.5% of the population has blood type ab. suppose a random sample of 50 u. s. residents and 40 australians is obtained. consider the random variables described below: x: the number of us residents (out of 50) with blood type ab. y: the number of australians (out of 40) with blood type ab. z: the total number of individuals (out of 90) with blood type ab. which of the following is true about the random variables x, y, and z? check all that apply. x is a binomial random variable with n = 50 and p = 0.04  y is a binomial random variable with n = 40 and p = 0.015  z is a binomial random variable with n = 90 and p = 0.055

Given details are:

X : the number of US residents (out of 50) with blood type AB.

Y : the number of Australians (out of 40) with blood type AB.

Z : the total number of individuals (out of 90) with blood type AB.

Following are true:

X is a binomial random variable with n = 50 and p = 0.04  

Y is a binomial random variable with n = 40 and p = 0.015

Explanation:

The sentences for X and Y are true. The sentence for Z is not true because Z=X+Y and X and Y do not have same probabilities.

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )