Answer:
7/2 =x
Step-by-step explanation:
The triangles are similar so we can write a ratio to solve
2 4
---- = -------
x 7
Using cross products
2*7 = 4x
14 = 4x
14/4 = 4x/4
7/2 =x
Answer:B
Step-by-step explanation:
Answer: 0.9738
Step-by-step explanation:
We assume that the scores follows a normal distribution.
Let
denotes the class average .
As per given we have,

Sample size : n= 12
The probability that a class of 15 students will have a class average greater than 70 on Professor Elderman’s final exam will be :

Hence, the correct answer = 0.9738