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2 years ago

The time it takes to charge the battery of a cell phone is directly proportional to the charge of the battery.

Mathematics

1 answer:

goldenfox [79]2 years ago

8 0

Answer:

4 i believe

Step-by-step explanation:

Im so sorry if this is wrong and for being late

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Chapter 7, Section 7.2, Question P9 The process for manufacturing a ball bearing results in weights that have an approximately n

bogdanovich [222]

a. Let $X$ be a random variable representing the weight of a ball bearing selected at random. We're told that $X\sim\mathcal N(0.15,0.005^2)$ , so

$\mathrm P(X$

where $Z\sim\mathcal N(0,1)$ . This probability is approximately

$\mathrm P(Z$

b. Let $X_i$ be a random variable representing the weight of the $i$ -th ball that is selected, and let $Y$ be the mean of these 4 weights,

$Y=\dfrac{X_1+X_2+X_3+X_4}4$

The sum of normally distributed random variables is a random variable that also follows a normal distribution,

$X_1+X_2+X_3+X_4\sim\mathcal N(4\cdot0.15,4\cdot0.005^2)$

so that

$Y\sim\mathcal N(0.15,0.005^2)$

Then

$\mathrm P(Y$

c. Same as (b).

8 0

3 years ago

A store offers a 30% discount on a coat that originally sold for $120. The coat still does not sell, so the store offers another

inna [77]

Step-by-step explanation:

helpful for you..........

5 0

2 years ago

Help asap pls!!!! correct answers only

zzz [600]

Answer:

Step-by-step explanation:

w/w+6 = 1/2

2w = w+6

w=6

3 0

3 years ago

What's equivalent to 4b

Nostrana [21]

Answer:

4 x 5

Step-by-step explanation:

6 0

3 years ago

I don't understand how you find the value of expressions. Ex..<br> 5•[7+7÷(6+1)]+4•12

Alexxandr [17]

= [7+7 <span>÷ 7] + 4.12
= [7+1] + 4.12
= 8 + 4.12
= 12.12

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4 0

3 years ago

Read 2 more answers