Set up a proportion to solve for x. A 18 B) 9 C) 4.2 D) 3 HELPP
1 answer:
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Answer with explanation:
Given : The age that children learn to walk is normally distributed with and
.
Let x be the age that children learn to walk .
B) Using formula
n= 19
For x= 11.5
For x= 12.5
Then, by using the z-value table , for the 19 people, the probability that the average age that they learned to walk is between 11.5 and 12.5 months old will be :-
Hence, for the 19 people, the probability that the average age that they learned to walk is between 11.5 and 12.5 months old = 0.9707
C. Using formula
For x= 11.5
For x= 12.5
Then, by using the z-value table , the probability that the average age that they learned to walk is between 11.5 and 12.5 months old will be :-
Hence, the probability that the average age that they learned to walk is between 11.5 and 12.5 months old = 0.3829