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Maitreya T

Numerade Educator

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Numerade tutor for 4 years
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Maitreya's Quick Ask Videos

03:29
Intro Stats / AP Statistics

A group of medical professionals is considering the construction
of a private clinic. If the medical demand is high (i.e., there is
a favorable market for the clinic), the physicians could realize a
net profit of $100,000. If the market is not favorable, they could
lose $40,000. Of course, they don't have to proceed at all, in
which case there is no cost. In the absence of any market data, the
physicians' best guess is that there is a 50-50 chance the clinic
will be successful.
Construct a small decision tree and, do the calculations, and
highlight the final decision of the medical professionals.

02:35
Intro Stats / AP Statistics

1. Find the sample standard deviation for the following
data sets and show your work.
6, 2, 8, 9, 5
2. Why we divide by n-1 instead
of n when computing a sample variance and standard
deviation?

01:56
Intro Stats / AP Statistics

Giorgio has determined that 19% percent of the
thousands of photos of rainbows posted to a website show double
rainbows. Let R be the number of rainbow photos Giorgio looks
at until a photo shows a double rainbow. Assume that the images in
each photo are independent.
Find the expected number of photos Giorgio will have to
look at before he finds one that shows a double rainbow. Then, find
and standard deviation. Round to the nearest
thousandth.
μ =
σ =

02:14
Intro Stats / AP Statistics

A random variable has a triangular probability density function
with a = 50, b = 375,
and m = 250.
(a)
Sketch the probability distribution function for this random
variable. Label the points a =
50, b= 375, and m = 250 on
the x-axis. Choose the correct graph below.
(i)

02:26
Intro Stats / AP Statistics

Use the table to answer the question. Note:
Round z-scores to the nearest hundredth and then find
the required A values using
the table.
A manufacturer of light bulbs finds that one light bulb model has a
mean life span of 1030 hr with a standard deviation
of 84 hr. What percent of these light bulbs will
last as follows? (Round your answers to one decimal place.)
(a) at least 930 hr
%
(b) between 820 and 890 hr
%

01:56
Intro Stats / AP Statistics

A decision tree branch has an expected monetary value of 155.
The probability of failure is 0.2 with an outcome value of -25.
What is the outcome value of success?

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