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nevsk [136]
2 years ago
11

A personal computer is used for office work at home, research, communication, personal finances, education, entertainment, socia

l networking, and a myriad of other things. Suppose that the average number of hours a household personal computer is used for entertainment is two hours per day. Assume the times for entertainment are normally distributed and the standard deviation for the times is half an hour. Find the probability that a household personal computer is used for entertainment between 2.1 and 2.45 hours per day. Round your answer to four decimal places.
Mathematics
1 answer:
riadik2000 [5.3K]2 years ago
8 0

Answer:

Step-by-step explanation:

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2 years ago
The profile of the cables on a suspension bridge may be modeled by a parabola. The central span of a bridge is 1270 ft long and
deff fn [24]

Answer:

Step-by-step explanation:

Given

span of bridge L=1270\ ft

height of span h=157\ ft

Equation of Parabola

y=0.00039x^2

|x| i.e.

-635

\frac{dy}{dx}=2\times 0.00039

length of Arc=\int_{a}^{b}\sqrt{1+(\frac{dy}{dx})^2}

=\int_{-635}^{635}\sqrt{1+(\frac{dy}{dx})^2}

=\int_{-635}^{635}\sqrt{1+(0.00078x)^2}

=2\times \int_{0}^{635}\sqrt{1+(0.00078x)^2}

=2\times (660.08)

=1320.16\ ft

4 0
2 years ago
The length of a side of a triangle is 26 in. A line, parallel to the given side ,divides the triangle into 2 parts of equal area
lubasha [3.4K]

Answer:

13√2

Step-by-step explanation:

The areas of the larger triangle, and the smaller triangle (formed when the larger triangle was cut by the parallel line) are similar. Therefore we can compare their areas:

Area1/Area2 =  (Length1)^2/(Length2)^2,

x/2x = (Length1)^2/(26)^2,

1/2 = (Length1)^2/676,

(Length1)^2 = 676/2 = 338

Length1 = √1352 = 13√2

6 0
2 years ago
jesse drive 6 3/8 miles in a golf cart during a round of golf. Payton drives 7 3/4 miles . how much father dose payton drives
slava [35]
Hello!  To answer your question, on how much farther Payton drives than Jesse, you need to understand the needed operation for this problem.  From the given problem, you can assume that 7 3/4 is a bigger fraction than Jesse's 6 3/8.  Once you figure out which operation is needed to find out how much more Peyton drove, you want to make both mixed numbers into inproper fractions.  To make a mixed number into an improper fraction, you multiple the whole number by the denometer and add the product to the numeratior.  Think of it as going around a clock if that helps.  Once they are both improper, give them both a common denometer (if needed).  Once you do that, you use the operation you decided on earlier; multiplication, division, addition, or subtraction.  If you have any other questions on my answer, or any information I've given, feel free to shoot me a message or another question.  I hope this helped, good luck!
4 0
2 years ago
Read 2 more answers
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