3) In an effort to monitor the level of lead in the air after an explosion at a battery factory, the following lead readings were taken for 6 days following the explosion (in ug/m3). What is the point estimate for the population mean lead level in the air over the 6 days following the explosion? Monday 5.40 Tuesday 1.10 Wednesday 0.42 Thursday Friday Saturday 0.73 0.48 1.10 A) 0.73 B) 2.91 C) 0.42 D) 1.54 E) 0.50