Recent questions and answers in Probability Distribution

A discrete random variable $x$ has the following probability distributioxs. Find $p(3$ $<$ $x$ $<$ $7)$ $\begin{array} {llllllll} X:& 0& 1& 2& 3& 4& 5& 6& 7& 8 &\\ {P(X):}& a& 3a &5a& 7a& 9a &11a &13a &15a&17a \end{array}$

answered Aug 27, 2020 by godfreymanchishi25

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A discrete random variable $x$ has the following probability distributioxs.Find $p(x<3)$ $\begin{array} {llllllll} X:& 0& 1& 2& 3& 4& 5& 6& 7& 8 &\\ {P(X):}& a& 3a &5a& 7a& 9a &11a &13a &15a&17a \end{array}$

answered Feb 11, 2020 by rashi.goyal2002

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Marks in an aptitude test given to $800$ students of a school was found to be normally distributed. $10\%$ of the students scored below $40$ marks and $10\%$ of the students scored above $90$ marks. Find the number of students scored between $40$ and $90$ .

answered Sep 20, 2013 by sreemathi.v

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If the hight of $300$ students are normally distributed with mean $64.5$ inches and standard deviation $3.3$ inches,find the hight below which $99\%$ of the student lie.

answered Sep 19, 2013 by sreemathi.v

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The mean weight of $500$ male students in a certain college in $151$ pounds and the standard deviation is $15$ pounds. Assuming the weights are normally distributed, find how many students weigh more than $185$ pounds

answered Sep 19, 2013 by sreemathi.v

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The mean weight of $500$ male students in a certain college in $151$ pounds and the standard deviation is $15$ pounds. Assuming the weights are normally distributed, find how many students weigh between $120$ and $155$ pounds

answered Sep 19, 2013 by sreemathi.v

1 answer

The life of army shoes is normally distributed with mean $8$ months and standard deviation $2$ months. If $5000$ pairs are issued, how many pairs would be expected to need replacement within $12$ months.

answered Sep 19, 2013 by sreemathi.v

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Suppose that the amount of cosmic radiation to which a person is exposed when flying by jet across the united states is a random variable having a normal distribution with a mean of $4.35 m$ rem and standard deviation of $0.59m$ rem. What is the probability that a person will be exposed to than $5.20m$ rem of cosmic radiation of such flight.

answered Sep 19, 2013 by sreemathi.v

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If $Z$ is a standard normal variate. Find the value of $c$ for the following $P(Z > c)=0.85$

answered Sep 19, 2013 by sreemathi.v

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If $Z$ is a standard normal variate. Find the value of $c$ for the following $P(-c < Z < c)=0.40$

answered Sep 19, 2013 by sreemathi.v

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If $Z$ is a standard normal variate. Find the value of $c$ for the following $P(0< Z < c)=0.25$

answered Sep 19, 2013 by sreemathi.v

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If $X$ a normal variate with mean $80$ and standard deviation $10$ compute the following probabilities by standardizing. $P(85\leq$ X $\leq$ 95 $)$

answered Sep 19, 2013 by sreemathi.v

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If $X$ a normal variate with mean $80$ and standard deviation $10$ compute the following probabilites by standardizing. $P(70$ $<$ X $)$

answered Sep 19, 2013 by sreemathi.v

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If $X$ a normal variate with mean $80$ and standard deviation $10$ compute the following probabilities by standardizing. $P(65\leq$ X $\leq$ 100 $)$

answered Sep 19, 2013 by sreemathi.v

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If $X$ a normal variate with mean $80$ and standard deviation $10$ compute the following probabilities by standardizing. $P(X\leq$ 80 $)$

answered Sep 19, 2013 by sreemathi.v

1 answer

If $X$ a normal variate with mean $80$ and standard deviation $10$ compute the following probabilities by standardizing. $P(X\leq$ 100 $)$

answered Sep 19, 2013 by sreemathi.v

1 answer

The number of accidents in a year involving taxi drivers in a city follows a poisson distribution with mean equal to $3$ out of $1000$ taxi drivers find approximately the number of driver with more than $3$ accidents in a year $[e^{-3}=0.0498].$

answered Sep 19, 2013 by sreemathi.v

1 answer