Suppose that the age that children learn to walk is normally distributed with mean 12 months and standard deviation 1 month. 19 randomly selected people were asked what age they learned to walk. round all answers to two decimal places. a. xbar~ and( , ) b. for the 19 people, find the probability that the average age that they learned to walk is between 11.5 and 12.5 months old. c. what is the probability that one randomly selected person learned to walk when they were between 11.5 and 12.5 months old

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

step-by-step explanation:

answer: the sun

explanation:

water cycle describes the evaporation of water from earth's surface, formation of clouds and precipitation water back onto the surface of earth. seventy percent of the earth is covered with water in the form of seas and oceans. the heat of the sun causes the evaporation of water from the surface of the ocean. the water vapors rise and condense to form water droplets. the collection of these water droplets form clouds which rain down again.

the evaporation of the oceans surface water as part of the water cycle is caused by the sun