## A group of students is counting the number of plastic bags placed in a landfill during a single day. what are the students doing? A. starting a promblem b. drawing a conclusion c. making a hypothesis d. collecting data by the way this is ecology!!

October 15, 2019// Blog//

**Answer:**

Probability of a person having both type O blood and the Rh− factor is %

**Explanation:**

The probability of a person having O blood group is

The probability of a person having Rh- factor is

The probability of a person having either O blood group or Rh- Factor is

Hence, As per the additive rule of probability

Probability of event A and B together Probability of A Probability of A probability of either A or B

Here event A is occurrence of O blood group

event B is occurrence of Rh- factor

Substituting the given values in above equation, we get –

Probability of a person having both type O blood and the Rh− factor