Suppose the x-axis of a density graph represents someone's age in years. If the area under the density graph from 20 years to 70 years is 0.77, what is the probability of someone's age being anywhere from 20 years to 70 years?
A. 85%
B. 77%
C. 93%
D. 61%

what is the probability of someone's age being anywhere from 20 years to 70 years is (B) 77%

Step-by-step 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%