Is it true that every 7.5 seconds, one person dies?

Yes its true. All you have to do is Google world death rate.

World Birth and Death Rates

Birth Rate
• 360,000 births per day

Death Rate
• 151,600 people die each day

• 15,000 births each hour
• 6,316 people die each hour

• 250 births each minute
• 105 people die each minute

• Four births each second of every day
• Nearly two people die each second