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Step2247 [10]
3 years ago
5

Casey Bought 9 Tickets To A Concert The Total Charge Was $104 Including A $5 Service Charge

Mathematics
1 answer:
frez [133]3 years ago
7 0
(104-5)/9
take 104 subtract 5 for the service charge and then divide by how many tickets were bought
$11 per ticket 
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The time needed to complete a final examination in a particular college course is normally distributed with a mean of 77 minutes
Komok [63]

Answer:

a. The probability of completing the exam in one hour or less is 0.0783

b. The probability that student will complete the exam in more than 60 minutes but less than 75 minutes is 0.3555

c. The number of students will be unable to complete the exam in the allotted time is 8

Step-by-step explanation:

a. According to the given we have the following:

The time for completing the final exam in a particular college is distributed normally with mean (μ) is 77 minutes and standard deviation (σ) is 12 minutes

Hence, For X = 60, the Z- scores is obtained as follows:

Z=  X−μ /σ

Z=60−77 /12

Z=−1.4167

Using the standard normal table, the probability P(Z≤−1.4167) is approximately 0.0783.

P(Z≤−1.4167)=0.0783

Therefore, The probability of completing the exam in one hour or less is 0.0783.

b. In this case For X = 75, the Z- scores is obtained as follows:

Z=  X−μ /σ

Z=75−77 /12

Z=−0.1667

Using the standard normal table, the probability P(Z≤−0.1667) is approximately 0.4338.

Therefore, The probability that student will complete the exam in more than 60 minutes but less than 75 minutes is obtained as follows:

P(60<X<75)=P(Z≤−0.1667)−P(Z≤−1.4167)

=0.4338−0.0783

=0.3555

​

Therefore, The probability that student will complete the exam in more than 60 minutes but less than 75 minutes is 0.3555

c. In order to compute  how many students you expect will be unable to complete the exam in the allotted time we have to first compute the Z−score of the critical value (X=90) as follows:

Z=  X−μ /σ

Z=90−77 /12

Z​=1.0833

UsING the standard normal table, the probability P(Z≤1.0833) is approximately 0.8599.

Therefore P(Z>1.0833)=1−P(Z≤1.0833)

=1−0.8599

=0.1401

​

Therefore, The number of students will be unable to complete the exam in the allotted time is= 60×0.1401=8.406

The number of students will be unable to complete the exam in the allotted time is 8

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3 years ago
Please help. right answer will be brainliest.
jek_recluse [69]

Answer:

24 square units

Step-by-step explanation:

6×4=24

3 0
3 years ago
66x + 8= 20x -15<br> Solve
tensa zangetsu [6.8K]

66x + 8 = 20x - 15

66x - 20x = -15 - 8

46x = -23

x = -23/46

x = -1/2

<h3>#CMIIW</h3>

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2 years ago
What is this math answer?
qwelly [4]

Answer: me + u is us

Step-by-step explanation:

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2 years ago
Is 28/49=4/7 a ratio proportion
leva [86]
28 / 49
divide by 7 at top and bottom

(28/7) / (49/7)
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