All of these can cause a starter not to rotate, EXCEPT ________
A) Seized engine crankshaft B) Defective armature
C) Defective starter drive D) Shorted field coils
C
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The age of an ancient piece of organic matter can be estimated from the rate at which it emits beta particles as a result of carbon-14 decay. For example, if X is the number of particles emitted in 10 minutes by a 10,000-year-old bone fragment that contains 1 g of carbon, then X has a Poisson distribution with mean ? = 45.62. An archaeologist has found a small bone fragment that contains exactly 1 g of carbon. If t is the unknown age of the bone, in years, the archaeologist will count the number X of particles emitted in 10 minutes and compute an estimated age with the formula
Unknown to the archaeologist, the bone is exactly 10,000 years old, so X has a Poisson distribution with
? = 45.62.
a. Generate a simulated sample of 1000 values of X, and their corresponding values of .
b. Estimate the mean of .
c. Estimate the standard deviation of .
d. Estimate the probability that will be within 1000 years of the actual age of 10,000 years.
e. Estimate the probability that will be more than 2000 years from the actual age of 10,000 years.
f. Construct a normal probability plot for . Is
approximately normally distributed?
One challenge that newer buildings might present to firefighters is that they:
A. use technology that may not be fully tested. B. are mainly built for appearance, not structural stability. C. may include features that are now obsolete or dangerous. D. tend to be more compartmentalized than older structures.
What are the two main types of duct-cleaning equipment being used?
A) Units that use brushes and vacuum and units that use ultrasonic particle precipitation B) Units that use high-velocity air and units that use sprayed cleaning compounds C) Large truck-mounted units and small portable units D) Ultraviolet units and ultrasonic particle precipitators
On the main distribution frame (MDF), the subscriber termination from the outside plant is on the horizontal side and the switch is connected to the vertical side
Indicate whether the statement is true or false