Math (Stats)
posted by Ray
Consider the the distribution of underinflated tires on a fourwheel automobile. The mass
density is given by:
p(0) = 0.4, p(1) = p(2) = p(3) = 0.1, p(4) = 0.3
a) Find the expected value and the variance of this distribution.
b) For what proportion of such cars will the number of underinflated tires be within 1 standard deviation of the mean?
Respond to this Question
Similar Questions

Physics
The four tires of an automobile are inflated to an absolute pressure of 2.0*10^5 Pa. Each tire has an area of 0.024m^2 in contact with the ground. Determine the weight of the automobile. Pressure*area= force. There are four tires. 
physics
The four tires of an automobile are inflated to a gauge pressure of 1.8 multiplied by 105 Pa. Each tire has an area of 0.025 m2 in contact with the ground. Determine the weight of the automobile. No idea how to start, please help. 
Physics
The four tires of an automobile are inflated to a gauge pressure of 1.8E10^5 Pa. Each tire has an area of 0.025 m2 in contact with the ground. Determine the weight of the automobile. I was helped with this before, but the answer was … 
physics: drwls
drwls for the question below, the answer seems to be wrong: The four tires of an automobile are inflated to a gauge pressure of 1.8 multiplied by 105 Pa. Each tire has an area of 0.025 m2 in contact with the ground. Determine the weight … 
physics
The four tires of an automobile are inflated to a gauge pressure of 88500 Pa. Each tire has an area of 0.0276 m2 in contact with the ground. Determine the weight of the automobile. Answer in units of N. 
PHYSICS
The four tires of an automobile are inflated to an absolute pressure of 200000 Pascals. Each tire has an area of 0.024 m^2 in contact with the ground. Determine the weight of the automobile. 
College Physics
The four tires of an automobile are inflated to a gauge pressure of 2.0x10^5 Pa. Each tire has an area of 0.024m^2 in contact with the ground. Determine the weight of the automobile. 
Physics
The four tires of an automobile are inflated to a gauge pressure of 1.84E+5 Pa. Each tire has an area of 0.0237 m2 in contact with the ground. Determine the weight of the automobile. 
Physics
An automobile has four tires, each one inflated to a gauge pressure of 176,357 Pa. Each tire is slightly flattened by its contact witht he ground, so that the area of contact is 21.9 cm by 17.9 cm. What is the weight of the automobile? 
physics
A 2000kg automobile with fourwheel drive and weight distributed equally on the four 60cm diameter wheels can accelerate from 0 to 27 m/s (60 MPH) in 6 seconds. a. Calculate the minimum coefficient of static friction between the …