A study considered risk factors for HIV infection among 500 intravenous drug users. Previous studies have shown that 45% of intravenous drug users...

A study considered risk factors for HIV infection among 500 intravenous drug users. Previous studies have shown that 45% of intravenous drug users are HIV positive.

1. What is the probability that 210 to 235 intravenous drug users in this study will be HIV positive.

2. What is the probability that at most 230 intravenous drug users in this study will be HIV positive 

PLEASE SHOW ALL THE STEPS AND WORKINGS IF NOT MONEY WILL NOT BE AWARDED. Thanks