a survey planned to determine the mean annual family expenses of employees of a large company. company wishes to be 95% confident that the sample is correct to within += $50 of the population mean annual family expenses. previous study indicates that the standard deviation is $400.How large of a sample is necessaryif management wants to correct thin +- $25, how employees need to be selected.

where r the answers

step-by-step explanation:

x = 3 ± √(5+y)

she will sew have sewn five dresses   and be 1/3 done with the sixth one in an hour.

step-by-step explanation:

3/4 of an hour=45 mins

lucy makes 1 dress per 11.25 minutes

45 mins+11.25 mins=56.25 mins

60 mins- 56.25 mins=3.75 mins

3.75 mins is 1/3 of of 11.25 mins

therefore she the other 1/3 would be part of the hour and she will have sewn 5 dresses and begun the sixth.

contact me if you have any questions you are welcome.