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Semmy [17]
3 years ago
6

A tennis player hits a serve that cannot be returned 45 percent of time. out of 300 serves, how many can you predict will not be

returned
Mathematics
2 answers:
Aleks [24]3 years ago
8 0
135 ; If you are allowed to use a calculator to determine percents you can do 300 × 45% = and it gives you your answer.
Travka [436]3 years ago
5 0

Answer:

Answer:

135

Explanation:

45% means 45 out of 100

Serving 300 times means 45 not returned each 100

300 /100 = 3

  45 × 3 = 135

Step-by-step explanation:


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One option in a roulette game is to bet $ 6
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Answer:

<h2>We have 47% of chances to win those six bucks.</h2>

Step-by-step explanation:

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5 0
2 years ago
The amount of time that a customer spends waiting at an airport check-in counter is a random variable with mean 8.0 minutes and
strojnjashka [21]

Answer:

P ( 5 < X < 10 ) = 1

Step-by-step explanation:

Given:-

- Sample size n = 49

- The sample mean u = 8.0 mins

- The sample standard deviation s = 1.3 mins

Find:-

Find the probability that the average time waiting in line for these customers is between 5 and 10 minutes.

Solution:-

- We will assume that the random variable follows a normal distribution with, then its given that the sample also exhibits normality. The population distribution can be expressed as:

                                   X ~ N ( u , s /√n )

Where

                            s /√n = 1.3 / √49 = 0.2143

- The required probability is P ( 5 < X < 10 ) minutes. The standardized values are:

                        P ( 5 < X < 10 ) = P (    (5 - 8) / 0.2143 <  Z  <  (10-8) / 0.2143   )

                                                 = P ( -14.93 < Z < 8.4 )

- Using standard Z-table we have:

                        P ( 5 < X < 10 ) = P ( -14.93 < Z < 8.4 ) = 1        

7 0
3 years ago
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