The weights (in pounds) of babies born at St. Mary's hospital last month are summarized in the table. Find the class limits for the second class. Weight (Ib) Number of Babies 5.0-6 6 6.1- 7.1 18 7.2 -8.2 19 8.3 -9.3 8 9.4 - 10.4 5 O. A. lower limit: 6.1; upper limit: 7.2 O B. lower limit: 6.1; upper limit: 7.1 O C. lower limit: 6.05; upper limit:7.15 O D. lower limit: 6; upper limit: 7.2A sample of 265 shoppers at a large suburban mall were asked two questions: (1) Did you see a television ad for the sale at department store X during the past 2 weeks? (2) Did you shop at department store X during the past 2 weeks? The responses to the questions are summarized in the table. What is the probability that a randomly selected shopper from the 265 questioned did not shop at department store X? Round to the nearest thousandth. Shopped at X Did Not Shop at X Saw ad 145 25 Did not see ad 25 70 O A. 0.094 O B. 0.642 O C. 0.358 O D. 0.264\fA bag contains 25 wooden beads. The colors of the beads are red, blue, white, green, black, brown, and grey. The probability of randomly selecting a bead of a particular color from the bag is given below. Is this a probability model? Color Red Blue White Green Black Brown Grey Probability 0.28 0.24 0.20 0.16 0.12 0.08 0.03 O Yes O NoFind the z-score for the value 86, when the mean is 100 and the standard deviation is 4, rounding to two decimal places. O A. z= - 3.75 O B. Z= - 3.50 O C. z= 0.82 O D. Z= - 0.82Find the indicated probability. If necessary, round to three decimal places. Suppose that E and F are two events and that P(E) = 0.7 and P(F|E) = 0.9. What is P(E and F)? O A. 0.630 O B. 0.063 O C. 0.778 O D. 1.600A study was designed to investigate the effects of two variables - (1) a student's level of mathematical anxiety and (2) teaching method - on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 270 with a standard deviation of 50 on a standardized test. Assuming a bell-shaped distribution, where would approximately 68% of the students score? A. between 170 and 370 O B. between 220 and 320 O C. below 220 or above 320 O D. below 170 or above 370