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dadnapper
13.10.2019 •
Mathematics
Out of 2000 random but normally distributed numbers with a mean of 45 and a standard deviation of x, approximately 1360 numbers are found to be between 40 and 50. what is the value of x?
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Ответ:
p = 1360 / 2000 * 100 = 68 %
It means that for normal distribution the values 40 and 50 are within +/- 1 standard deviation from the mean ( 45 ).
45 - x = 40 and 45 + x = 50.
x = 45 - 40 = 50 - 45 = 5
x = 5
Ответ:
point A ( 2, 3) →→ ( -2 , 3)
Step-by-step explanation:
Given : if point A is reflected over the y axis and its original location was (2,3).
To find : where is its new location.
Solution : We have given that point ( 2, 3)
point A is reflected over the y axis.
By the reflection over y axis rule : ( x ,y) →→ ( -x , y)
Here only the x coordinate will change .
Then , point A ( 2, 3) →→ ( -2 , 3)
Therefore, point A ( 2, 3) →→ ( -2 , 3)