A supply of hex nuts is produced, and production records indicate a mean mass of 7.8 g with a standard deviation of 0.3 g. Assuming a normal distribution, estimate the percent of hex nuts with mass less than 7.5 g.

add an !

step-by-step explanation:

a. is correct

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

im pretty sure it would be 5 am, hope that , and give brainliest and guys if this is right then press the button and give 5 stars