Answer: 200
Explanation:
Given : A hotel chain recently surveyed 300 new customers and asked them to rate their overall satisfaction with their recent hotel stay.
The survey estimated a mean satisfaction
with a standard deviation
.
Let x represents the rating given by customer.
Using formula ,
.
For x = 6, z= -1
For x= 8 , z=1
The probability that new customers gave the hotel a rating of 6,7, or 8 will be :-

The number of new customers gave the hotel a rating of 6,7, or 8 will be :-
[Rounded to the nearest tens]
Hence, the approximate number of new customers gave the hotel a rating of 6,7, or 8 =200