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777dan777 [17]
3 years ago
12

Polly looks in her piggy bank and sees she has 9 quarters, 6 dimes, 3 nickels and 20 pennies. How much money does she have in al

l?
Mathematics
1 answer:
Akimi4 [234]3 years ago
8 0
2.25
+.60
2.85
+.15
3.00
+.20

=3.20
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The life expectancy (in hours) of an electric bulb is normally distributed with a mean of 5000 and a standard deviation of 1000.
Sergeu [11.5K]

Answer:

P(z>1.3) = 0.9032

Step-by-step explanation:

We are given:

Mean = 5000

Standard deviation = 1000

x = 6300

P(x>6300)=?

z-score =?

z-score = x- mean/standard deviation

z-score = 6300 - 5000/1000

z- score = 1300/1000

z-score = 1.3

So, P(x>6300) = P(z>1.3)

Looking at the z-probability distribution table and finding value:

P(z>1.3) = 0.9032

So, P(z>1.3) = 0.9032

7 0
3 years ago
Can someone plz help me with #2, #3, #4, #14
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8 0
3 years ago
At 10AM the temperature
Alecsey [184]

Answer:-1 °F

Step-by-step explanation:

4 0
3 years ago
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Graph the direct variation y=−1.5x. Using the graph, find:
Mariana [72]
Y=-3

-3=-1.5x
you substitiue y value, then you divide both sides by -1.5 and you get 2 for x.
(2,-3)

y=4.5
4.5=-1.5x
you substitute y value, then again you divide both sides by -1.5 and you get 3.
(3,4.5)



y=6
6=-1.5x
same thing for this last one. then once again divide by -1.5 and you get -4.
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7 0
3 years ago
What is the measure arc PD?<br> a) 35°<br> b) 90°<br> c) 110°<br> d) 180°
solmaris [256]

Answer:

  c)  110°

Step-by-step explanation:

Arc FP is twice the measure of the marked angle, so is 70°. If FD is supposed to be a diameter, then arc FPD is a semicircle (180°) and arc PD is 180° -70° = 110°.

7 0
3 years ago
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