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.
Answer:
Perimeter: 10.1 m
Area: 6.16 m^2
Step-by-step explanation:
For perimeter just add up all the sides except for 2.8 m since that is set aside for area.
For area multiply the length 2.2 by the height 2.8 m. The reason behind this is that using a slanted height makes know sense sine when you measure things they should be perfectly as possible vertical
Answer:
456 students
Step-by-step explanation:
In order to find 95% of the 480 students, you can set up the equation below:
x * 100 = 480 * 95
x = 45600 / 100 = 456
95% of 480 students is 456 students.
Answer:
6 girls
Step-by-step explanation:
60/100 x 50 = 30
30 girls in class
20/100 x 30 = 6
6 girls are wearing jeans
You and do 9/8 and you can do 8.65/ 2.77