Question

Need help with part "D"

W 7.3.11 :3 Question Help O In an advertising campaign, a snack company claimed that every 18-ounce bag of its cookies contained at least 1000 chocolate chips. Two statisticians attempted to verify the claim. The accompanying data represent the number of chips in an 18-ounce bag of the company's cookies based on their study. Complete parts (a) through (e) Click here to view the chocolate chip data table. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). (c) Using the sample mean and sample standard deviation obtained in part (b) as estimates for the population mean and population standard deviation, respectively, draw a graph of a normal model for the distribution of chips in a bag of cookies. O A. OB. Observed value Observed value Observed value Observed value TTTTTTTTTTTTT 1000 1400 1800 2200 900 1200 1500 1800 TTTTTTTTTTTTTTTTTTT 600 1000 1400 1800 900 1200 1500 1800 (d) Using the normal model from part (C), find the probability that an 18-ounce bag of chips selected at random contains at least 1000 chips. The probability is (Round to three decimal places as needed.) Enter your answer in the answer box and then click Check Answer.

Answer 1

Mean x = x/n = 1247.45 = (x − x)2/(n-1) = 10152.97 Variance Standard deviation =V Variance = 100.762 Sample size n =40 P(x>1000) = P(1097.367.45) =P(Z< -2.56) =1-P(z<-2.56) 100.762 = 1-0.005 =0.995