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Luba_88 [7]
4 years ago
10

A radio station claims that the amount of advertising each hour has a mean of 15 minutes and a standard deviation of 2.9 minutes

. You listen to the radio station for 1 hour and observe that the amount of advertising time is 16 minutes. Calculate the ​z-score for this amount of advertising time. Round to the nearest hundredth.
Mathematics
1 answer:
Ilia_Sergeevich [38]4 years ago
6 0

Answer:

0.1296

Step-by-step explanation:

Use the normpdf function available on basic calculators:

normpdf(16,15,2.9) = 0.1296

This is the z-score representing 16 minutes.  Note that 16 is just one point above 15, so this small positive z-score makes sense.

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What is (x+6)(x+4)(x-3) expand and simplify
mestny [16]

Answer:

x³ + 7x² - 6x - 72

Step-by-step explanation:

Given

(x + 6)(x + 4)(x - 3) ← expand the second and third factor, that is

(x + 4)(x - 3)

Each term in the second factor is multiplied by each term in the first factor, that is

x(x - 3) + 4(x - 3) ← distribute both parenthesis

= x² - 3x + 4x - 12 ← collect like terms

= x² + x - 12

Now multiply this by (x + 6) in the same way

(x + 6)(x² + x - 12)

= x(x² + x - 12) + 6(x² + x - 12) ← distribute both parenthesis

= x³ + x² - 12x + 6x² + 6x - 72 ← collect like terms

= x³ + 7x² - 6x - 72

7 0
3 years ago
Homework Week 13 and 14<br> Introduction to Inequalities
irina [24]

Answer:

you are going to have to look from left to right and see if it is above or below

7 0
3 years ago
Please helpppppp!!!!
chubhunter [2.5K]

Answer:

A. -34.5>x

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The area is shaded below -34.5, so we know that x has to be less

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3 years ago
Total of 49 1/4 + 3 3/8
Ede4ka [16]
49*4=196+1=197/4 
<span>8*3=24+3=27/8 </span>

<span>then make the denominator the same</span>
<span>multiply 197*2 and 4*2 = 394/8 </span>
<span>then 394/8 +27/8 =421/8 </span>
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3 years ago
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Dennis_Churaev [7]
Ivan gets £112.5(0) more than Tanya
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