# Question

It is said that sufferers of a cold virus experience symptoms for 7 days. However, the amount of time is actually a normally distributed random variable whose mean is 7.5 days and whose standard deviation is 1.2 days.

a. What proportion of cold sufferers experience fewer than 4 days of symptoms?

b. What proportion of cold sufferers experience symptoms for between 7 and 10 days?

a. What proportion of cold sufferers experience fewer than 4 days of symptoms?

b. What proportion of cold sufferers experience symptoms for between 7 and 10 days?

## Answer to relevant Questions

How much money does a typical family of four spend at a McDonald’s restaurant per visit? The amount is a normally distributed random variable with a mean of $16.40 and a standard deviation of $2.75.a. Find the probability ...The lifetimes of televisions produced by the Hishobi Company are normally distributed with a mean of 75 months and a standard deviation of 8 months. If the manufacturer wants to have to replace only 1% of its televisions, ...The mean and variance of the time to complete the project in Exercise 7.58 was 145 minutes and 31 minutes2. What is the probability that it will take less than 2.5 hours to overhaul the machine?A bank wishing to increase its customer base advertises that it has the fastest service and that virtually all of its customers are served in less than 10 minutes. A management scientist has studied the service times and ...Use a computer to find the following probabilities.a. P(t64 > 2.12)b. P(t27 > 1.90)c. P(t159 > 1.33)d. P(t550 > 1.85)Post your question

0