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

i do agree with robert moses’ statements about wiping out cities that are an “impediment to new growth”. in order to have a positive community, the city must continue to grow either in terms of size or economics. therefore wiping out cities that restrict growth benefits the overall society and all the people living in it. similar to a social contract, i believe that if a person was to live in a community they must sacrifice some of their rights, in this case property, for the overall good of the people. as long as these people living in the cities are reimbursed and the purpose of wiping out the cities is to serve the public, there is no problem with robert moses’ core idea.