A=8
Explanation: a+b=12 a-b=4
^^^^^^^ ^^^^^^
8+4=12 8-4=4
A=8
Answer: yes.
Step-by-step explanation:
Answer:
The percentage of students who scored below 620 is 93.32%.
Step-by-step explanation:
Problems of normally distributed samples are 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 question, we have that:

Percentage of students who scored below 620:
This is the pvalue of Z when X = 620. So



has a pvalue of 0.9332
The percentage of students who scored below 620 is 93.32%.
Answer:
the amount that should be worth in 25 years is $2,155,770
Step-by-step explanation:
The computation of the amount that should be worth in 25 years is shown below:
As we know that
Future value = Present value × (1 + rate of interest)^number of years
= $250,000 × (1 + 0.09)^25
= $250,000 × 1.09^25
= $2,155,770
Hence, the amount that should be worth in 25 years is $2,155,770