Answer:
The data item is 
Step-by-step explanation:
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean
and standard deviation
, the z-score of a measure X is given by:

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.
Mean of 400 and a standard deviation of 60.
This means that 
z=3
We have to find X when Z = 3. So




The data item is 
Answer:
Jim is 5, Dad is 20
Step-by-step explanation:
Since dad is 4 times as old as Jim that means 5 x 4=20 and in ten years Jim will be 15 and Dad will be 30 and 15 x 2 is 30.
Hope this helps!
Answer:
1/8
Step-by-step explanation:
5 green marbles
40 marbles in total
so 5/40
And that simplifies to 1/8
Answer:
Option A. 5 and 7
Step-by-step explanation:
we know that
If two angles are supplementary, then their sum is equal to 180 degrees
In this problem
m∠5+m∠6=180° -----> by supplementary angles (form a linear pair)
m∠6+m∠7=180° -----> by supplementary angles (form a linear pair)
therefore
Angle 5 and angle 7 are supplementary with angle 6