Aphysics class has 40 students. of these, 17 students are physics majors and 16 students are female. of the physics majors, seven are female. find the probability that a randomly selected student is female or a physics major.

Probability of female   P(f)   =  0,575    or   57,5  %

Probability of physic majors  P = 0,425 or  42,5 %

Step-by-step explanation:

a) Probability that a random selected student is female:

Let call P(f)  such probability   is  P(f1)  + P(f2)

we have to evaluate 2 branch of the tree, working as follows

1.Probability of students as physics major is P(f1)

17/40     and after that the probability of student physics majors being female is 7/17, Therefore for that side we have probability

P(f1)  = ( 17/40)* (7/17)    =  119/680

2.-Probability of students as female from 40 student is

16/40

Then   P(f)  = ( 119/680) + 16/40       P(f)  = 391/680

P(f)  = 0,575    or    57,5%

b) Probability of physics majosr is:

P(pm)  =  17/40

P(pm)  =  0,425     or   42,5 %

the volume is the product of the area of the base, 3x(3x+4), and the height, 3x-1

step-by-step explanation:

there has been genes found in the x chromosome of males that have been linked to [homo/hetero]sexuality. in addition to the reign of the x chromosome, a section of chromosome 8 has also been link to, "alot of ppl are so " these facts were proven true after a 2014 study of a gay male and his strait brother. according to newscientist.com,"chromosome 14 and is mainly active in the thyroid, but also the brain. called tshr, it makes a type of receptor protein that recognises and binds to a hormone that stimulates the thyroid. in this way, the gene plays an important role in controlling thyroid function. the fact that tshr seems to be involved in sexual orientation fits with evidence that thyroid function seems to be linked to sexuality."

in conclusion, "ppl are so gay" due to their genetics.