What is -9x - 5 - 8 + x in Simple form
1 answer:
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Answer:
Percentage of scores that fall between 70 and 80 = 24.34%
Step-by-step explanation:
We are given a test with a population mean of 75 and standard deviation equal to 16.
Let X = Percentage of scores
Since, X ~ N()
The z probability is given by;
Z = ~ N(0,1) where,
= 75 and
= 16
So, P(70 < X < 80) = P(X < 80) - P(X <= 70)
P(X < 80) = P( <
) = P(Z < 0.31) = 0.62172
P(X <= 70) = P( <
) = P(Z < -0.31) = 1 - P(Z <= 0.31)
= 1 - 0.62172 = 0.37828
Therefore, P(70 < X < 80) = 0.62172 - 0.37828 = 0.24344 or 24.34%
Answer: C) 5.5 cm.
Step-by-step explanation:
From the given , it can be clearly seen that in triangle DBE , G and H are the midpoints of segment DB and DE respectively.
Also, GH is parallel to BE. [By Converse of Basic proportionality theorem]
Length of BE= 11 cm.
Further more,
Hence, the BEST ESTIMATE for segment GH is 5.5 cm.
Note :
Converse of Basic Proportionality Theorem says that when a line (or a segment) divides any two sides of a triangle in equal proportion then the line ought to be parallel to the remaining third side.