c) A teacher administers a test to her 55-6 students. The teacher wants to summarize 60- the results the students attained as a mean and standard deviation. 6. As part of a report on its employees, a company published this graph. Our Employees at a Glance Mean = 10.2 years 225 Standard Deviation = 4.1 years in 200 200 a) Usi 182 as t 175 164 me 150 151 wa 137 b) Did Frequency 125 127 109 for 106 100 99 91 c) Ca 84 mi 75 69 66 55 d) DI 50- 51 42 in 36 25 25 15 11 8. Appli 308 2 4 46 8 10 12 14 16 18 20 102 6 Years Worked devi a) The standard deviation is given as Miss 4.1 years. Identify which numbers of of 1 years worked are within one standard dod deviation of the mean. a) ( b) What percent of the employees are within b ) two standard deviations of the mean? c) How does this graph help to explain z-scores