Question

Suppose the nightly rate for a three-star hotel in Paris is thought to be bell-shaped and symmetrical with a mean of 160 euros and a standard deviation of 8 euros. The percentage of hotels with rates between 144 and 176 euros is

Question 9 options:

approximately 68.

at least 89.

approximately 95.

at least 75.

10.) The ________ measures the variability, or spread, of the data points in a set around the set's mean.

Question 10 options:

	mode
	variance
	median
	range

Answer 1

#9 ) Let x be the nightly rate for a three star hotel.

x follows normal distribution with mean ( µ ) = 160 and standard deviation (σ) = 8

P( 144 < x < 176 )

=

=P( -2 ≤ z ≤ 2 )

According to Empirical rule:

Approximately 95% of the observations fall within 2 standard deviations of the mean or area between z= -2 and z= 2 is 0.95

Answer : approximately 95%

#10)

The Variance measures the variability, or spread, of the data points in a set around the set's mean.