Help me pls i have like 6 more question and i need help with them pls :< this is the first one

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population, find the population standard deviation, o.79828588912497

Asap its important using the information in the customer order, determine the length and width of the garden. enter the dimensions. length: feetwidth: feet

Joe has a rectangular chicken coop. the length of the coop is 4 feet less than twice the width. the area of the chicken coop is 510 square feet. what is the length of the chicken coup?