A teacher selects a student at random from his class of 20 students every week for 20 consecutive weeks. There are 8 girls and 12 boys in the class. What is the probability that there are exactly 12 weeks in which a girl is selected

The value is  

Step-by-step explanation:

From the question we are told that

   The number of boys in the class is  

   The number of girls in the class is  

   The total number of students is  is  n  =  20

    The number of weeks is  N  = 20

The probability of selecting a girl is mathematically represented as

=>

The probability of not  selecting a girl is mathematically represented as  

=>

Generally the selection of students from the class  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 there are exactly 12 weeks in which a girl is selected is mathematically represented as

=>  

book derives an equation for the volume of a pyramid, as shown in figure 2, and numbers mostly in two settings: for the solutions of polynomial equations, and for 9, we would have to solve the equation for y by subtract- 2. the point (1,. 2) is the center of the circle whose equation is x2 y2. 2x. 4y p.w.c. davies.

step-by-step explanation:

i think it is c, not positive though

step-by-step explanation: