About 90% of American adults had chickenpox before adulthood. We now consider a random sample of 150 American adults I only need help with B) and c) part of this question. a) How many people in this sample would you expect to have had chickenpox in their childhood? (Enter your answer as a whole number.) b) Would you be surprised if there were 132 people who have had chickenpox in their childhood? (Round your answer to two decimal places.) Since z = ?c) What is the probability that 132 or fewer people in this sample have had chickenpox in their childhood?

a) We expect to have 135 people to have had chickenpox in their childhood.

b) No, I would not be surprised, as the probability is not low.

z = -0.6812

c) P(X≤132)=0.248

Step-by-step explanation:

a) This is a binomial random variable, with n=150 and p=0.9, so we can calculate the expected value as:

b) To answer this we can calculate the probability that 132 people or fewer have had chickenpox in their childhood.

This binomial random variable can be approximated by a normal distribution, with the following parameters:

To calculate the probability that 132 people or fewer have had chickenpox in their childhood we compute the z-score for X=132.5 (as we apply the continuity factor) and calculate the probability using the standard normal distribution:

line or a linear equation graph

step-by-step explanation:

"it's not the heat, it's the humidity".   that's a partly valid phrase you may have heard in the summer, but it's actually both.   the heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature.   this has important considerations for the human body's comfort.   when the body gets too hot, it begins to perspire or sweat to cool itself off.   if the perspiration is not able to evaporate, the body cannot regulate its temperature.   evaporation is a cooling process.   when perspiration is evaporated off the body, it effectively reduces the body's temperature.   when the atmospheric moisture content (i.e. relative humidity) is high, the rate of perspiration from the body decreases.   in other words, the human body feels warmer in humid conditions.   the opposite is true when the relative humidity decreases because the rate of perspiration increases.   the body actually feels cooler in arid conditions.   there is direct relationship between the air temperature and relative humidity and the heat index, meaning as the air temperature and relative humidity increase (decrease), the heat index increases (decreases).

step-by-step explanation: