3 years ago

Ben has 3 times as many guppies as goldfish. If he has a total of 20 fish, how may guppies does he have?

Mathematics

1 answer:

olchik [2.2K]3 years ago

7 0

15 guppies 5 goldfish ,

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Multiply (1.4 x 10^2) x (2.0 x 10^-5)

Mars2501 [29]

Answer:

2.8 x 10^-3

Step-by-step explanation:

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3 years ago

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Step-by-step explanation:

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3 years ago

Daniel bought 2 pounds of mixed nuts for $7.18 . Which ratio is proportional to 2 pounds at $7.18

Oliga [24]

$7.18 / 2 = $3.59 per pound

.........................................
so 1 lb = $3.59
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4 years ago

The product of 45/87 and --9/10 is

grandymaker [24]

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0.4655172413793

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3 years ago

A toy maker claims his best product has an average lifespan of exactly 14 years. A skeptical quality control specialist asks for

slamgirl [31]

Answer:

interval = [17.3948 , 20.6052]

Step-by-step explanation:

given,

random sample (n) = 45

average product lifespan = 19 years

standard deviation = 4 years

confidence interval of 99 % = ?

we know,

t* = qt(1.99/2 + 44 ) = qt(0.995,44)

t* = 2.692

so,

interval

$x = 19 \pm t* \times (\dfrac{s}{\sqrt{n}})$

$x = 19 \pm 2.692 \times (\dfrac{4}{\sqrt{45}})$

$x = 19 \pm 2.692 \times 0.5963$

$x = 19 \pm 1.6052$

interval = [19 - 1.6052 , 19 + 1.6052]

interval = [17.3948 , 20.6052]

4 0

3 years ago