what is the probability of someone's age being anywhere from 20 years to 70 years is (B) 77%
Explanation:
As Given in the question that the x-axis of a density graph represents someone's age in years
This mean the probability distribution curve of age( i.e. X is given as the graph.
Area under two values of x of a probability density curve = probability that x lies between these two values
Using the above information we know that the area under the he density graph from 20 years to 70 years is 0.77,we get that
P(20<x<70) = 0.77
Converted into percent this equals 77 %
Hence, the probability of someone's age being anywhere from 20 years to 70 years is option is (B) 77%