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4 years ago

13

Suppose a brand of lightbulbs is normally distributed with a mean life of 1900 hours and a standard deviation of 50 hours. Find

the probability that a lightbulb will last between 1825 hours and 1980 hours

1 answer:

Alexxandr [17]4 years ago

6 0

I am not sure exactly how to do it but based on my knowledge, I think the answer would be 1/38

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I am doing this fr a meme so whoever responds is cool and I will mark brailiest

Free_Kalibri [48]

Answer:

Step-by-step explanation:

yesssss

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3 years ago

A pan is heated to 393°F, then removed from the heat and allowed to cool in a kitchen where the room temperature is a constant 6

deff fn [24]

Answer:

The approximate temperature of the pan after it has been away from the heat for 9 minutes is 275.59°F.

Step-by-step explanation:

The formula for D, the difference in temperature between the pan and the room after t minutes is:

$D = 324\cdot e^{-0.05t}$

Compute the approximate difference in temperature between the pan and the room after 9 minutes as follows:

$D = 324\cdot e^{-0.05t}$

$=324\times e^{-0.05\times 9}\\\\=206.59$

Then the approximate temperature of the pan after it has been away from the heat for 9 minutes is:

D = P - R

206.59 = P - 69

P = 206.59 + 69

P = 275.59°F

Thus, the approximate temperature of the pan after it has been away from the heat for 9 minutes is 275.59°F.

6 0

3 years ago

Determine the kinetic energy of a 100-kg roller coaster car that is moving with a speed of 20.0/ms.

rjkz [21]

Answer:

The kinetic energy is 20,000\ J

Step-by-step explanation:

The kinetic energy of a body is defined as:

$k = \frac{1}{2}ms ^ 2$

Where <em>m</em> is the mass of the roller coaster car

<em>s</em> is the speed and <em>k</em> is the kinetic energy

We know that $s = 20\ m/s$

$m = 100\ kg$

Then the kinetic energy of the roller coaster car is:

$k = \frac{1}{2}(100)(20) ^ 2\\\\k = 50(20) ^ 2\\\\k = 50 * 400\\\\k = 20,000\ J$

3 0

3 years ago

Find the circumference of a pizza with a diameter of 18 inches

tatyana61 [14]

The circumference of a circle is PiD, or 2(3.14)(r).

The radius is half the diamater.
Let's solve with the diameter.

18 • 3.14 = 56.52 inches.

I hope this helps!

8 0

3 years ago

PLEASEEEE!!!!! HELPPPPPPPPPPP

Feliz [49]

Answer:

what's your question I can't understand

5 0

3 years ago

Read 2 more answers