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3 years ago

PLEASE HELP!! WILL GIVE BRAINLIEST!!

Mathematics

1 answer:

Kazeer [188]3 years ago

3 0

Answer:

r is between 0 and 8

Step-by-step explanation:

Since Rachel only has enough money for 8 rolls, the upper limit is 8 for r. The lower limit must be none because she doesn't have to buy and rolls. Therefore, r must be between 0 and 8.

Thank you, and I hope you learned from this answer! Please mark this as brainliest if you learned from this!

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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

John left a $2 tip for the server when stopped at a diner. If this was 20% of his order total, how much was his order?

Katen [24]

The answer is 10 dollars

4 0

2 years ago

Read 2 more answers

How many solutions does 3.2p-2.5+2.1p=5p-7/2

Sergio039 [100]

Answer:

-3.3...

Step-by-step explanation:

3.2p-2.5+2.1p=5p-7/2

3.2p+2.1p-5p=-7/2+2.5

5.3p-5p=-7/2+2.5

0.3p=-1

p=-1/0.3

p=-3.3

5 0

3 years ago

Simplify the rational expression by rationalizing the denominator √15/√6x

noname [10]

Answer:

√10/2x

Step-by-step explanation:

Multiply by √6 on the top and bottom to rationalize the denominator.

(√15×√6)/(√6x×√6) = √90/6x = (√9×√10)/6x = 3√10/6x = √10/2x

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3 years ago

What is the unit price for one cd if 3 cds cost 29.85?

zavuch27 [327]

You would do 29.85 ÷ 3 which equals 9.95. You would do the in verse operation. Hope I helped you.

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3 years ago