Suppose that 25% of all students who have to buy a physical copy of the 9th edition of our textbook want a new copy (the "successes"), whereas the other 75% want a used copy. each chooses independently of the others. consider randomly selecting 30 purchasers. a) what is the expected value of the number of students who want a new copy of the book? write out all formulas in your work.

7 or 8

Step-by-step explanation:

This situation can be modeled with the Binomial Distribution which give the probability of an event that occurs exactly k times out of n, and is given by

where  

= combination of n elements taken k at a time.

p = probability that the event (“success”) occurs once

q = 1-p

In this case, the event “success” is wanting a new copy  of the book with probability 25% = 0.25 and n=30 students randomly chosen.

The expected value for a binomial distribution is the mean np, so in this case the expected value of the number of students who want a new copy of the book would be

np = 30*0.25 = 7.5

To make sense of this value, we could say that 7 or 8 students out of 30 want a new copy of the book.

the most boring thing ever written

step-by-step explanation:

i am writing something. yes, i plan to make it the most boring thing ever written. i go to the store. a car is parked. many cars are parked or moving. some are blue. some are tan. they have windows. in the store, there are items for sale. these include such things as soap, detergent, magazines, and lettuce. you can enhance your life with these products. soap can be used for bathing, be it in a bathtub or in a shower. apply the soap to your body and rinse. detergent is used to wash clothes. place your dirty clothes into a washing machine and add some detergent as directed on the box. select the appropriate settings on your washing machine and you should be ready to begin. magazines are stapled reading material made with glossy paper, and they cover a wide variety of topics, ranging from news and politics to business and stock market information. some magazines are concerned with more recreational topics, like sports card collecting or different kinds of hairstyles. lettuce is a vegetable.

step-by-step explanation: s