Answer:
The answer is
B. Compatible Numbers Strategy
Step-by-step explanation:
According to learnalberta "The compatible numbers strategy is a method of estimating computations by using "friendly" or "nice" numbers that can be easily calculated mentally. Compatible numbers can be used in estimating sums, differences, products and quotients."
So the closest number to 249 that can be divided by 12 is 240
240/12= 20
Given:
The table and the relative frequency histogram show the distribution of the number of tails and three coins are tossed.
To find:
The probability 
.
Solution:
In the given table T represents the number of tails.
From the given table it is clear that the value of probability is 
and 
. So,
Therefore, the probability is equal to .
Answer:
-10%
Step-by-step explanation:
price elasticity of demand = % change in demand / % change in price
Here, the "price" changes from 15 to 45, so its percent change is ...
((new value)/(old value) -1) × 100%
= (45/15 -1) × 100%
= 200%
The % change in demand is given as -20%, so the price elasticity is ...
price elasticity of demand = (-20%)/(200%) = -0.10 = -10%
