solve using given info

We wish to give a 90% confidence interval for the fraction of fruit flies which possess a certain gene. In order to develop the confidence interval we have obtained a random sample of 500 fruit flies. We find that 200 of the flies possess the gene. Give the endpoints of the 90% confidence interval for the true population proportion of fruit flies with the gene. 0.36 to 0.44 0.38 to 0.42 0.34 to 0.46 0.32 to 0.48