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Sonbull [250]
3 years ago
5

Thirty five percent of what equals five

Mathematics
1 answer:
notsponge [240]3 years ago
7 0

Answer:

14.29

is the answer make me brainlist

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Certain tubes manufactured by a company have a mean lifetime of 800 hours and a standard deviation of 60 hours. Find the probabi
Anna71 [15]

Answer:

Step-by-step explanation:

given that certain tubes manufactured by a company have a mean lifetime of 800 hours and a standard deviation of 60 hours.

Sample size n =16

Std error of sample mean = \frac{\sigma}{\sqrt{n} } \\= 15

x bar follows N(800, 15)

the probability that a random sample of 16 tubes taken from the group will have a mean lifetime

(a) between 790 and 810 hours,

=P(790

(b) less than 785 hours

=P(X

, (c) more than 820 hours,

=P(X>820)\\=p(Z>1.333)\\= 0.0913

(d) between 770 and 830 hours

=P(|Z|

4 0
3 years ago
The distance traveled by a toy car can be modeled by D(t) = t3 − 3t2 + t − 3, where t > 3 represents time in seconds. If the
Bogdan [553]

Answer:

t^2+1

Step-by-step explanation:

We are given that

Distance traveled by a toy car

D(t)=t^3-3t^2+t-3

Where t>3

Time taken by car =t-3 seconds

We have to find the expression which represents the speed of the toy car.

We know that

Speed=\frac{Distance}{time}

Using the formula

Speed=\frac{(t^3-3t^2+t-3)}{t-3}

Speed=\frac{t^2(t-3)+(t-3)}{t-3}

Speed=\frac{(t-3)(t^2+1)}{t-3}

Speed=t^2+1

Hence, the expression  which represents the speed of the toy car

t^2+1

5 0
3 years ago
If a= square a over square b=x then what stamens is true
Dahasolnce [82]

Answer:

C I thinks

Step-by-step explanation:

If you square both sides that is what you get.

(Also can I please have Brainliest? I need it to level up!)

6 0
3 years ago
A group of ten students were given a statistics quiz. their scores were: 20, 19, 22, 20, 15, 18, 15, 21, 19, 20. the variance of
svet-max [94.6K]
<h3>Answer: Approximately 2.33</h3>

The variance is given to be 5.43

Apply the square root to the variance to get the standard deviation

s = standard deviation

v = variance

s = sqrt(v)

s = sqrt(5.43)

s = 2.330326 which is approximate

s = 2.33

I rounded to 2 decimal places as this is the number of decimal places used for the variance.

5 0
3 years ago
If G is the circumcenter of triangle ABC, find CG and FB. Round to the nearest tenth if necessary.
Stolb23 [73]

9514 1404 393

Answer:

  CG = 19

  FB = 14.7

Step-by-step explanation:

The circumcenter is equidistant from the triangle vertices, so GA = GB = GC.

The length of GA is given, so we have ...

  GA = 19 = CG

__

Then the Pythagorean theorem can be used to find FB.

  FB² +FG² = GB²

  FB² = GB² -FG² = 19² -12² = 217

  FB = √217 ≈ 14.7

3 0
3 years ago
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