Find the expected value of the random variable.The random variable X is the number of siblings of a student selected at random from a particular secondary school. Its probability distribution is given in the table.
A. 1.479
B. 2.5
C. 1.771
D. 1.375
Answer: A
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Describe how you would apply the five basic steps of a statistical study to the given issue. You want to know the percentage of adults in the U.S. who have ever sought treatment from a practitioner of complementary medicine.
What will be an ideal response?
Solve the problem.The city bridge has 5 lanes, all carrying equal numbers of cars. If 215 cars drive across the bridge, how many cars cross in each lane?
A. 48 cars B. 220 cars C. 44 cars D. 43 cars
In an adiabatic process (one in which no heat transfer takes place), the pressure P and volume V of an ideal gas such as oxygen satisfy the equation 
where C is a constant. Suppose that at a certain instant of time, the volume of the gas is 2L, the pressure is 100 kPa, and the pressure is decreasing at the rate of 5 kPa/sec. Find the rate at which the volume is changing.
a. 14 L/sec
b. C–14 L/sec
c. C–
d. 
Solve the equation.13x2 - 34 = 5
A. 3 or ?3
B. 
or ?
C. 3
D. 