Question

1. With the virus outbreak, the average number of times Justin washes his hands during the day is 14 with a standard deviation of 3. Assuming that this number is normally distributed, what is the probability that tomorrow he will wash her hands between 16 and 22 times? Use the z-table to answer the question (Select the answer that is closest to the answer that you calculated.)

   		0.33
   		0.79
   		0.95
   		0.5
   		0.67

2. The mean age of presidents at inauguration is 55 years. The age of presidents at inauguration is normally distributed with a standard deviation of 6.6 years. Donald Trump was 70 years old when he was inaugurated. What proportion of presidents were younger than Donald Trump at their inauguration? Use the z-table to answer this question (Select the answer that is closest to the answer that you calculated.)

   		2.273
   		0.988
   		0.012
   		0.786
   		None of the above

3. Use this information to answer the following two questions: Varshini wants to read 4 books this month, but her busy work schedule may get in the way of her goal. Let X represent the number of books she will read this month. The table below shows the probabilities associated with the number of books she will read this month.

   X	P(X = x)
   0	0.17
   1	0.23
   2
   3	0.32
   4	0.16

   What is the probability that she reads less than 3 books?

   		0.48
   		0.52
   		0.84
   		0.74
   		This cannot be determined based on the data provided.

Answer 1