Answer:
456
Step-by-step explanation:
Let X be the SATscore scored by the students
Given that X is normal (1000,200)
By converting into standard normal variate we can say that
is N(0,1)
To find the top 10% we consider the 90th percentile for z score
Z 90th percentile = 1.28
i.e. only students who scored 456 or above only should be considered.
Answer:
20
Step-by-step explanation:
We can use similar triangles
12/3 = x/5
x = 20
Answer:
21) x=4 y=5
22) y=10 but im not sure what x is
Answer:
D. 11655
Step-by-step explanation:
First find the 90th term:
a90=a1+(n−1)d
= -4+89(3)=263
Then find the sum:
Sn = n(a1 + an) / 2
S90 = 90 (-4 + 263) /2
S90 = 23,310/2
<u>S90 = 11,655</u>
Answer:
5/12
Step-by-step explanation:
The whole book can be represented as 12/12 because 12 divided by 12 equals one whole ( or one). 1/3 * 4/4(one rewritten) = 4/12 We then need to add this to 1/4 * 3/3 (one rewritten again) = 3/12
4/12 + 3/12 == 7/12
7/12 is the amount Julie did read so we subtract this from 12/12 to get the answer:
5/12
