If X is a normal random variable with mean 5, and if the probability that X is more than 4.08 is .5910 (as shown below) , then what is the standard deviation of X? (Note: the diagram is not necessarily to scale.) 
Definitions:
General Partnership
A business arrangement where two or more individuals agree to share in all assets, profits, and financial and legal liabilities of a venture.
Unlimited Personal Liability
A legal obligation where an individual's personal assets can be used to satisfy business debts and liabilities without limit.
Represents Himself
Refers to an individual who acts as his or her own legal representative in court, without an attorney.
Liability of a Partner
The legal responsibility of each partner in a partnership for the debts and obligations of the business, which can extend to their personal assets.
Q1: The degrees of freedom for a
Q18: If the equation for the regression line
Q35: A time series graph is useful for
Q40: Statistics is the science of conducting studies
Q41: Which of the following is a Pareto
Q44: The _ is obtained by first adding
Q47: A researcher wants to investigate whether
Q56: If the variances are not known, and
Q67: Stating the hypothesis is the first step
Q77: The area under the normal distribution curve