The answer is 76. multiply 15 times 4 which is 60.
and the triangle is the difference of the sides, so 19-15=4.
so then multiply the base and height, this leaves 4x4 which is 16.
then add the two. 60+ 16= 76
Answer:
no it is not
Step-by-step explanation:
Answer
X=7
Steps:
Subtract 6
21=3w
Divide by 3
X=7
Answer:
a:b = 3:5
Step-by-step explanation:
As a:b is required, divide both terms by b
5a:b + 3b:b = 6b:b
5a:b + 3 = 6
5a:b = 6 - 3
5a:b = 3
a:b = 3:5
It may help you to consider the standard normal curve. If the mean here is 70%, then 0.5 of the area under this curve. In other words, half the students received a grade > 70%. That would be 100 students.
Note that 84 is 2 std dev above the mean.
Recall the Empirical Rule: 95% of scores lie within 2 std. dev of the mean.
Measuring from the mean, that would be 47.5% above the mean and 47.5% below the mean. The area to the right of the mean is 0.5. Subtract 0.475 from that to obtain the fraction of students who rec'd a grade greater than 2 std dev from the mean: It's 0.025.
Then the # of students who rec'd a grade greater than 84% would be
0.025(200 students) = 5 students.
