Step-by-step answer:
The normal probability curve is symmetrical about the mean.
This means that for an event that is normally distributed, there is a 50% probability that it falls below the mean, and a 50% probability that it falls above.
From the given information, the mean is 20" and we need the probability that a given infant is longer than 20", namely the mean.
Therefore by the definition of the normal probability curve, there is a 50% probability that the length falls above 20".
This can be verified by referencing a normal probability table with Z=0, meaning at the mean, the probability is equal to 0.5 for Z<0, and therefore 0.5 for Z>0.
Z=(X-mean) / Standard deviation
When Z>0, X (measurement) is greater than the mean
When Z<0, X is less than the mean.
Answer:
93
Step-by-step explanation:
by remainder theorem p(3) is the remainder
and therefore it is 93
Supplementary Angle. Adjacent Angle.
Answer:
60° and 30°
Step-by-step explanation:
I'm going to assume you mean complementary angles.
Complementary angles are angles that form 90° or a right angle
From the question, it is saying that
(5x) +(4x-18) = 90
To work out x, solve the equation
9x-18 = 90
9x = 108
x = 12
Therefore the angle of 5x is 5x12 or 60° and the angle of (4x-18) is going to be 4x12-18 = 30°