The number specifically designated for "vendors" or medical staff. It won't be the regular customer service number. That number is for the members or those carrying that particular insurance.
Health insurance offers a way to reduce such costs to more reasonable, affordable amounts. The way it typically works is that the consumer pays an up front premium to a health insurance company and that payment allows you to share "risk" with lots of other people who are making similar payments.
Answer: Ambulatory monitoring of the electrocardiogram in 100 healthy 14 to 16 year old boys showed heart rates ranging from 45 to 200 beats/minute during the day and from 23 to 95 beats/minute during sleep.
The answer is going to be 90%.