An intelligence quotient (IQ) is a measure of a person's intellectual abilities that include cognitive skills such as reasoning, logic, and problem-solving. IQ scores are
normally distributed with an average of 100 and a standard deviation of 10.
What percentage of people have IQ scores between 70 and 130?
68%
95%
84%
99.7%

I think it's 68%

Step-by-step explanation:

The answer is 68% . It's not exactly but I think it is

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.