A data set is normally distributed with a mean of 42 and a standard deviation of 9. What percent of the data values lie between 15 and 60?

97.59%.

Step-by-step explanation:

z-score for  data value 15 = (15-42) / 9

= -3.

z-score for data value (60 - 42) /9

= 2.

Using the standard normal tables we get:

= 0.4772- ( - 0.4987)

= 0.9759.

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

happy to

pls mark as brainliest.