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mixer [17]
3 years ago
7

20000 students took a standardized math test. The scores on the test are normally distributed, with a mean score of 85 and a sta

ndard deviation of 5. About how many students scored between 90 and 95?
Mathematics
1 answer:
Tpy6a [65]3 years ago
7 0

Answer: 2718

Step-by-step explanation:

Given: Mean score = 85

Standard deviation = 5

Let x be the score of a random student that follows normal distribution.

Then, the probability that a student scored between 90 and 95 will be

P(90< x < 95)\\\\=P(\dfrac{90-85}{5}

The number of students scored between 90 and 95 = 0.1359 x (Total students)

= 0.1359 (20000)

= 2718

Hence, The number of students scored between 90 and 95 = 2718

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(you and 3 friends so we have 4 person
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8 0
3 years ago
Pls answer this for meeee​
Roman55 [17]

Answer:

7 hamsters at 5 pesos each and 13 hamsters at 8 pesos each

Step-by-step explanation:

5x + 8y = 139

x + y = 20

x = 20 - y

5x + 8y = 139

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100 - 5y + 8y = 139

100 + 3y = 139

3y = 139 - 100

3y = 39

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x + y = 20

x + 13 = 20

x = 20 - 13

x = 7

7 0
2 years ago
At 8:00 am, a building casts a shadow 75 feet long. The angle where the ray from the sun met the ground is 50°. How tall is the
OlgaM077 [116]
The angle of elevation of shadow from building is 50 degrees
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the height of the building is 89.38 feet
4 0
3 years ago
Five times the sum of e and 4 is equal to -7.
andre [41]
5+ 4e = -7 is the correct answer.
5 0
2 years ago
Susan has $800 in a savings account that earns 6% annually. If the interest is not compounded, how much interest will she earn i
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Answer:

C

Step-by-step explanation:


5 0
3 years ago
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