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Liula [17]
2 years ago
8

Which expression is equivalent to (0.23t-0.3)-(0.7t-0.23)

Mathematics
1 answer:
shepuryov [24]2 years ago
6 0

Answer:

8282

Step-by-step explanation:

12

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The lifetime of a certain type of battery is normally distributed with mean value 15 hours and standard deviation 1 hour. There
KIM [24]

Answer:

If the lifetime of batteries in the packet is 40.83 hours or more then, it exceeds for 5% of all packages.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 15

Standard Deviation, σ = 1

Sample size = 4

Total lifetime of 4 batteries = 40 hours

We are given that the distribution of lifetime is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

Standard error due to sampling:

\displaystyle\frac{\sigma}{\sqrt{n}} = \frac{1}{\sqrt4} = 0.5

We have to find the value of x such that the probability is 0.05

P(X > x)  = 0.05

P( X > x) = P( z > \displaystyle\frac{x - 40}{0.5})=0.05  

= 1 -P( z \leq \displaystyle\frac{x - 40}{0.5})=0.05  

=P( z \leq \displaystyle\frac{x - 40}{0.5})=0.95  

Calculation the value from standard normal z table, we have,  

\displaystyle\frac{x - 40}{0.5} = 1.64\\x = 40.825 \approx 40.83  

Hence, if the lifetime of batteries in the packet is 40.83 hours or more then, it exceeds for 5% of all packages.

8 0
3 years ago
Practice B
Alona [7]

Answer:

Where did the writer go in holiday

4 0
2 years ago
You roll a standard number cube. Find P(number is not 2).
Morgarella [4.7K]
A standard number cube has 6 sides, and so the numbers are:

1,2,3,4,5,6

P, is any of those numbers that <em>are not 2</em>.

2 is one of the numbers in 6, and so it is 1/6 of the die.

6/6 - 1/6 = 5/6

C) 5/6 is your chance of getting a number that is not 2


hope this helps
7 0
3 years ago
Read 2 more answers
Which are partial products for 68 × 43?
3241004551 [841]
The correct answer is D? Its the only one that makes sense.
6 0
3 years ago
A runner runs a distance of 350 metres in a time of 50 seconds. What is his average speed?
rodikova [14]

Answer:

Average speed = <em>7</em><em> </em><em>metre</em><em> </em><em>per</em><em> </em><em>second</em>

Step-by-step explanation:

Average speed ( v ) = distance / time

=》v = 350 / 50

=》v = 7

so, average speed = 7 m / sec

5 0
3 years ago
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