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1. A certain research center requires an IQ score above 131.5.
Assume IQ scores are normally distributed with mean of 100 and standard
deviation of 15. Nine candidates took IQ tests. Find the probability that the IQ
score of a randomly chosen individual is at least 131.5?
2. A Company which produces cigarettes claims that it has now reduced the
amount of nicotine. The Supporting evidence consists of a random sample of 40
cigarettes and gives mean amount of nicotine 0.941 g and a standard deviation of
0.313g. What is the probability that mean nicotine amount is greater than 0.882 g.
1. A system is tested for faults once per hour. If there is no fault, none
will be detected. If there is a fault, the probability is 0.8 that it will be detected. The
tests are independent of one another.
a) If there is a fault, what is the probability that it will be detected in 1 hour or less?
b) If there is a fault, what is the probability that it will be detected in 3 hours or
less?
c) What is the mean number of tests that must be conducted in order to detect a
fault?
2. The number of hits on a website follows a Poisson process with a
rate of 3 per minute.
a) What is the probability that more than a minute goes by without a hit?
b) If 2 minutes have gone by without a hit, what is the probability that a hit will
occur in the next minute?
Ca(s)+HgNO3(aq)→Ca(NO3)2(aq)+Hg(s)
Express your answer as a chemical equation
Number plates in an Arab country consist of 3 letters (chosen from a specified set of 20 letters from the Arabic alphabet) and 4 digits (from 0 to 9).
Find the probability of a plate having identical letters.
Find the probability of a plate having identical digits.
A ball kicked horizontally at 10.0m/s from a cliff 80m high. How far from the base of the cliff will the stone strike the ground?
Compute the 95 percent interval estimate of ų given ó = 9, n=40 and x= 115
formal report: which of the four companies you might like to work for has the strongest corporate ethics policies?
Determine the precision of these two approximate values
a) 32000ft
b) 1.20×10(--5)ms
1. YYouhave ice at 263 K (-10.0 oC) and 1.0 atm. What could you do to make the ice sublime?
2. A sample of dry ice (solid CO2) is cooled to 173 K (-100.0 oC), and is set on a table at room
temperature (298 K; 25 oC). At what temperature is the rate of sublimation and deposition the same (assume that
pressure is held constant at 1 atm)?
3. What are the significant differences between the phase diagrams of water and carbon dioxide? Discuss
each briefly.
Explain in your own words how the light reflects and absorb transmitted, give example
Draw a example of non-luminous and luminous object.
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#339914 on Dec 2023