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madreJ [45]
3 years ago
10

Question

Mathematics
2 answers:
julsineya [31]3 years ago
8 0

Answer:

65

Step-by-step explanation:

in 36 secs 39 words

in 1 sec 39/36 words

in 60 secs (39x60)/36 = 65 words

zepelin [54]3 years ago
6 0

Answer:

65 words.

Step-by-step explanation:

There are 60 seconds in 1 minute.

In 36 seconds she types 39 words.

in 1       ..   ..    ..   ..    ..   ..   39/36 words

in 60 seconds ..   ..   ..   ..   (39/36) * 60 = 65 words.

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A light bulb has a lifetime X that is exponentially distributed with a mean 340 hours. Find the probability that the bulb lifeti
LUCKY_DIMON [66]

Answer:

0.7026

Step-by-step explanation:

Let X denote the lifetime of light bulb. Given X \sim Exp(\lambda) where the mean is E(X) = 340 =\frac{1}{\lambda} \implies \lambda = \frac{1}{340} = 0.00294.

Recall that,

\displaystyle P(X>x) = 1 - \int_0^x e^{-\lambda x} = 1 - (1 - e^{-\lambda x} = e^{-\lambda x}

\displaystyle P(X>220 | X>100) = \frac{P(X>220,X>100)}{P(X>100)} = \frac{e^{-\lambda \times 220}}{e^{-\lambda \times 100}} = \frac{0.5236}{0.7452} = 0.7026

7 0
3 years ago
Ibrahim has some building blocks that are all cubes of the same size. He uses three of the blocks to make a pile with a height o
MArishka [77]

Answer:

72.5

Step-by-step explanation:

one block = 43.5 / 3 = 14.5

five blocks = 5 * 14.5 = 72.5 (ans)

4 0
3 years ago
A school newspaper decides to survey all the students enrolled in a gym class to determine the percentage of these students who
pishuonlain [190]

Answer:

A sudents who take gym class

Step-by-step explanation:

the survey only asks for all the students enrolled in a gym class so they can compare with the data for all the students enrolled in the football team

3 0
3 years ago
a garden table and bench cost $738 combined the garden table costs $88 more than the bench what is the cost of the bench
Viefleur [7K]
Hello 

the answer to this is 

650

becomes we subtract 
88 from 738

738-88 and we get 650

so we get 

650
hope this helps 
4 0
3 years ago
Read 2 more answers
-2 2/3, -5 1/3, -10 2/3, -21 1/3, -42 2/3. which formula can be used to describe the sequence?
Stella [2.4K]
Your sequence appears to be geometric with a common ratio of 2. It can be described by
  a(n) = (-2 2/3)·2^(n-1)

_____
This can be written in a number of other forms, including
  a(n) = (-8/3)·2^(n-1)
  a(n) = (-1/3)·2^(n+2)
  a(n) = (-4/3)·2^n
8 0
4 years ago
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