Find the Standard Deviation
7, 18, 15, 22, 5, 20
Round to one decimal place

1/4 because there is 4 grades.

144.50

step-by-step explanation:

21.5 x 13.4=288.10 divide by 2

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.