A company usually sends 9 workers to install a security system in a school building, and they complete the task in 96 minutes. Today, they only have 3 workers to do the same size job. How time should be scheduled to complete the job

288 minutes needed

Step-by-step explanation:

9 workers take 96 minutes each to finish. So the whole job takes:

9 x 96=864 worker-minutes

So 3 workers will take:

864/3=288 minutes working together

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0