Answer:
A student must obtain a grade of at least 84.2 in order to get an A.
Step-by-step explanation:
Problems of normally distributed samples 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.
In this problem, we have that:
If only the best 14 % of the students in the class will receive an A, what grade must a student obtain in order to get an A?
This is the value of X when Z is in the (100-14) = 86th percentile.
So it is the value of X when , and higher values of X. So
A student must obtain a grade of at least 84.2 in order to get an A.
Since the book was sold for 25.02.
The sell price = 24.
Tax = 25.02 - 24 = 1.02.
The rate is the percentage of the sell price.
= 1.02 / 24 * 100% Converting the 1.02 to fraction = 102 / 100
= (102/100) / 24 * 100
= 102 / 2400 * 100 Cancel the zeros at the top and bottom
= 102 / 24 * 1
= 102 / 24 2 into 102 = 51, 2 into 24 is 12
= 51 / 12. 3 into 51 is 17, 3 into 12 is 4.
= 17 / 4 Use your calculator.
= 4. 25
Tax rate = 4.25%. Cheers.
Answer:
D) 65 I believe
Step-by-step explanation:
What I did what 20 divided by 4, which gave me 5 doses per ounce. Then I multiplied 5 times 13 and that gave me 65
You can simply sum all those terms together, creating an expression involving a single term:
Answer:
63
Step-by-step explanation:
Total groups: 21
number of students in each group: 3
total = 21 *3 =63