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3 years ago

Can someone help please

Mathematics

1 answer:

Ymorist [56]3 years ago

8 0

Answer:it is 7 and 6 that is your answer if that does not work it is 12 and 13 ok.

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A researcher is selecting lab rats for her experiment. She assigns each rat a number and picks numbers out of a hat while blindf

laiz [17]

Answer: $\dfrac{76}{89}$

Step-by-step explanation:

The pool of rats from which the researcher is drawing participants is composed of the following:

23 male albino rats

21 male spotted rats

35 female albino rats

11 female spotted rats

Total rats = 23+21+35+11 =90

$P(male\ albino)=\dfrac{23}{90}$

After drawing first rat , total rats remained = 89

$P(\text{either a female albino rat or a male spotted rat})=\dfrac{35+21}{89}=\dfrac{76}{89}$

The probability of choosing a male albino rat and then either a female albino rat or a male spotted rat = $\dfrac{76}{89}$

7 0

3 years ago

If the length and the width of the plane section are 3/2in and 3/2 in what is the area of the plane section.

astraxan [27]

Answer:

EIther 45 or 15

Step-by-step explanation:

3 0

2 years ago

The radius of a parachute is shown below.

Oksanka [162]

Step-by-step explanation:

Diameter is 6 ft

3 ft + 3ft

3 0

3 years ago

Which is proportional to 3/4?

Serjik [45]

6/8 because 3/4*2=6/8
hope this helps

6 0

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