lhome

sprogram & courses

ogrades

& support

kforms & resources

links

libraryn

learning resourcesn

pennfoster. edun

e

x

s

jalyn coleman
student id: 54674545

exam lesson name: numeric expressions and operations
exam number: 700060rr

texam guidelines

texam instructions

question 4 of 20 :

select the best answer for the question.

4. a tool store owner bought 18 circular saws for $68 each and 22 cordless drills for $74 each. how much did the owner spend in all?

a. $3,122
b. $2,556
c. $2,852
d. $2,828

Amachine that produces a special type of transistor (a component of computers) has a 2% defective rate. the production is considered a random process where each transistor is independent of the others. (a) what is the probability that the 10th transistor produced is the first with a defect? (b) what is the probability that the machine produces no defective transistors in a batch of 100? (c) on average, how many transistors would you expect to be produced before the first with a defect? what is the standard deviation? (d) another machine that also produces transistors has a 5% defective rate where each transistor is produced independent of the others. on average how many transistors would you expect to be produced with this machine before the first with a defect? what is the standard deviation? (e) based on your answers to parts (c) and (d), how does increasing the probability of an event a↵ect the mean and standard deviation of the wait time until success?