Smith is a weld inspector at the shipyard. he knows you're keeping track of good and substandard welds that for the afternoon shift 5% of all worlds done will be substandard is smith checks 300 of the seney 500 rounds completed the shift which is probably that he will find less than 20 substandard welds

z = 3.87 is normal and definitely it is usual

Explanation:

given data

probability  P = 5 %

sample size: n = 300

solution

we use here Poisson Distribution and get average number of welds

average number of welds m = n × p

average number of welds m = 300 × 0.05

m = 1 5

and

standard deviation is =

standard deviation is =

standard deviation is = 3.77

so here by normal distribution

z value corresponding 30 sub standard

so z will be

z = x - Mean ÷ standard deviation  

z =  

z = 1.326

as z value base on standard normal curves that have maximum value = 3.77

z value = 1.32

so z = 3.87 is normal and definitely it is usual

a (congress) should be your answer since they make all federal laws in the u.s.