Apple uses cheap labor in factories in china to manufacture its cell phones. the probability that a phone is defective is 0.02. what is the probability that a sample of 500 iphones will contain exactly 5 defective phones? a.) what is the average number of defective phones? (no decimals) b.) the probability of getting 5 defective phones? (to thousandths)

Let x be the random variable representing defective phone. Let n be the sample size. Let p be the probability that phone is defective.

Given: n=500, p= 0.02

From given information we know that x is random variable such that p is the probability of success and it is constant for each trial. Sample size n is fixed.

X follows Binomial distribution with parameters n=500 and p=0.02

a). The average number of defective phone

E(x) = n*p = 500 * 0.02 = 10

The average number of defective phones is 10.

b)Probability of getting 5 defective phones.

P(X=5) =

=

= 0.037

The probability of getting exactly 5 defective is 0.037.

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5

nope.   happens to me as well.

-aparri