Answer:
Step-by-step explanation:
Idk tbh
Answer:
Test score of 75.7.
Step-by-step explanation:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean and standard deviation , the zscore of a measure X is given by:
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.
The results are normally distributed with a mean test score of 60 and a standard deviation of 8.
This means that
Calculate the test score above which 2.5% of all test scores lie.
Above the 100 - 2.5 = 97.5th percentile, which is the value of X when Z has a pvalue of 0.975, so X when Z = 1.96.
Test score of 75.7.
7x^2+3x+10 hope that helps!
Answer:
Step-by-step explanation:
<u>We know that:</u>
- Perimeter of a rectangle = Sum of all its sides
- Length of rectangle = 4x² - x + 2
- Width of rectangle = 5x - 3
To find the perimeter, we need to use the equation "Perimeter of a rectangle = Sum of all its sides".
<u>Solution:</u>
- Perimeter of a rectangle = Sum of all its sides
- => 2[{4x² - x + 2} + {5x - 3}] = Perimeter
- => 2[4x² - x + 2 + 5x - 3] = Perimeter
- => 2[4x² + {-x + 5x} + {2 - 3}]
- => 2[4x² + 4x - 1]
- => 8x² + 8x - 2
Hence, the perimeter of the rectangle is 8x² + 8x - 2.
Answer:
12 dollars
Step-by-step explanation:
100%-15%=85%
68÷85%=80
The original price was 80 dollars.