Ma'am / Sir, please help me. In the picture, you can see what is asked in the problem (a,b,c....) (No.1, a) answer was attached below

9 - ) No. of wheels Freeray ( x ) (y ) - O - OH = Y - total: 28 1 2 3 45 6 78 9 10Ammonia in car exhaust. Refer to the Environmental Sci- ence & Technology (Sept. 1, 2000) study on the ammonia levels near the exit ramp of a San Francisco highway tun- nel, ., The data (in parts per million) for 8 days during afternoon drive-time are reproduced in the table. a AMMONIA 1.53 1.50 1.37 1.51 1.55 1.42 1.41 1.48 Find the range of the ammonia levels. Find the variance of the ammonia levels. Find the standard deviation of the ammonia levels. . Suppose the standard deviation of the daily ammonia levels during morning drive-time at the exit ramp is 1.45 ppm. Which time, morning or afternoon drive- time, has more variable ammonia levels? any.\