07/24/19

Probability Distribution

A group of people were asked if they had run a red light in the last year where 169 responded "yes," and 491 responded "no." If a person is randomly chosen, find the probability that he/she has run... more

% Chance / Probability of multiple events occuring 1.5 times or more. Baseball Question!

I have the data, and the answer, but can't figure out the math driving it. Baseball Hitter has a x% chance of meeting or exceeding 1.5 hits,rbis,and runs in a game (think player proposition bets... more

F and H are sets of real numbers defined as follows.

F= {z│z ≤ 3}H= {z│z > 6}Write F U H and F ∩ H using interval notation. If the set is empty, write Ø

If P(E and F)=.392, P(E/F)=.56 and P(F/E)=.7, then find the following

A) P(E)=B)P(F)=C)P(E or F)=

07/15/19

Help please statistics

1A - Candidate Ames and Candidate Burton are both running for mayor in a small town. Early polling results for Candidate Ames are displayed below. Calculate the absolute and relative change in the... more

07/14/19

Calculus Question

Find the area of the region inside the cardiod r=2+2cos∅ and outside the circle r=3

07/14/19

parabola equation

An observatory has a large antenna to collect signals from space. The antenna has a curved surface with a parabolic cross section, and a microphone is located at the focus of the parabola. The... more

07/14/19

parabola equation

  A spotlight uses a parabolic reflector, a surface with a parabolic cross section, and a light bulb at the focus of the parabola. If the bulb is 5.5 inches from the vertex of the reflector, what... more

07/14/19

In triangle ABC,m<A=44°, m<B=48°, and a=25. Find "c" to the nearest tenth.

A. 18.6B. 48.1C. 36.0D. 52.6

What does it mean that the probability density function is proportional to a function?

I'm studying for SOA/CAS Exam P and I have a problem that says that $X$ is a continuous and positive random variable whose probability density function is proportional to: $$\\frac{1}{(1+x)^5}$$... more

What is the half year life of a radioactive material?

Find the half-life of a radioactive material if after 1 year 99.69% of the initial amount remains. (Round your answer to one decimal place.)

07/12/19

Chemistry lost.

A particular sample of neon gas has a pressure of 13.2 atm and volume of 2.0 L. What will the new pressure be of the sample of neon if the container's volume is expanded to 3.0 L?

07/10/19

Size of a certain

The size of a certain insect is given by p(t)= 500e .03t, where t is measured in days . What time will the population equal 2000?

07/10/19

Conservation of Energy 3

If a roller coaster begins at rest at the top of a hill, and at the bottom of the hill is moving at 16 m/s, how tall was the hill?

07/07/19

Is every symmetric positive semi-definite matrix a covariance of some multivariate distribution?

One can easily prove that every [covariance matrix](http://en.wikipedia.org/wiki/Covariance_matrix) is [positive semi-definite](http://en.wikipedia.org/wiki/Positive-definite_matrix). I come across... more

Poisson distribution

 A hospital director who has been studying daily emergency admission over 7 years has concluded that they are distributed according to the Poisson law, hospital records reveals that emergency... more

The radius r of a circle is increasing at a rate of 3 inches per minute. Find the rate of change of the area when r = 5 inches and r = 22 inches.?

The radius r of a circle is increasing at a rate of 3 inches per minute. Find the rate of change of the area when r = 5 inches and r = 22 inches.

06/30/19

Learning Friction #4

A 2 kg box sits on a table where the coefficient of friction is 0.2. A 20 N horizontal force pulls the box to the right. Find the acceleration. 

marginal cost of a product

The marginal cost of a product can be thought of as the cost of producing one additional unit of output. For​ example, if the marginal cost of producing the 50th product is​ $6.20, it cost​ $6.20... more

06/23/19

The Standard Normal Distribution

For the standard normal distribution, find the value of c such that:P(z > c) = 0.3002

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