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earnstyle [38]
3 years ago
6

Select all of the proportional relationships

Mathematics
2 answers:
LenKa [72]3 years ago
7 0
A,D can I get my Brainly
ValentinkaMS [17]3 years ago
5 0
I think it’s A and D
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The average amount of time that students use computers at a university computer center is 36 minutes with a standard deviation o
frosja888 [35]

Answer:

2119 students use the computer for more than 40 minutes. This number is higher than the threshold estabilished of 2000, so yes, the computer center should purchase the new computers.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 36, \sigma = 5

The first step to solve this question is finding the proportion of students which use the computer more than 40 minutes, which is 1 subtracted by the pvalue of Z when X = 40. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{40 - 36}{5}

Z = 0.8

Z = 0.8 has a pvalue of 0.7881.

1 - 0.7881 = 0.2119

So 21.19% of the students use the computer for longer than 40 minutes.

Out of 10000

0.2119*10000 = 2119

2119 students use the computer for more than 40 minutes. This number is higher than the threshold estabilished of 2000, so yes, the computer center should purchase the new computers.

8 0
3 years ago
Help please! I’ll give you brainlist
11111nata11111 [884]

Answer:

1,007 calories in total

Step-by-step explanation:

8 0
3 years ago
The graph shows the balance of an account that is earning interest over time.
VLD [36.1K]
The answer is D because if  you go to 150 and line it up you will get 7 as you answer 
6 0
3 years ago
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Please help !!!!!!!!!!!!!!!!!!!!!
Sholpan [36]

Answer:

c

Step-by-step explanation:


6 0
3 years ago
A lorry drives for 4 hours at a speed of 45 mph. Calculate how far it travles
Delvig [45]

Answer:

180 miles

Step-by-step explanation:

Distance = speed x time

45 x 4 =180miles

6 0
3 years ago
Read 2 more answers
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