<span>The level of measurement of the number of rooms in a single-family house is ratio scale.
A ratio scale </span><span>has measurements where the difference between values is meaningful. In other words, the differences between points on the scale are measurable and exactly equal. For example, the difference between 2 rooms and 4 rooms in a single family house is 2 rooms and is equal to the distance between 3 rooms and 5 rooms.
Also</span> the ratio scale has <span>has a meaningful zero. The zero in a ratio scale means that something doesn’t exist. For example, there are 0 rooms in a single family house means that there is no room in the house.</span>
<span>An annual premium is defined as the amount that someone is required to pay each year in order to keep his or her insurance policy active. If the insured person does not pay the premium amount by the policy's specified due date, the policy is cancelled. Some insurance companies offer a grace period after the due date, and if the premium is paid in this time frame, the policy is reinstated. </span>
Answer:
9
Step-by-step explanation:
9+9=18
it takes two nines to make 18