5. 172
6. 2139.3 repating
7. 1335
8. 151
9. 2117
10. 1174.5
11. 138
13. 307
X + y = 2400
y = 3x
x + 3x = 2400
4x = 2400
x = 2400/4
x = 600 <== Mrs. Storey drove 600 miles
y = 3x
y = 3(600)
y = 1800 <== Mr. Storey drove 1800 miles
The third one is negative im pretty sure
Answer:
a) The mean is 
b) The standard deviation 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 zscore 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 pvalue, we get the probability that the value of the measure is greater than X.
The probability a student selected at random takes at least 55.50 minutes to complete the examination equals 0.6915.
This means that when X = 55.5, Z has a pvalue of 1 - 0.6915 = 0.3085. This means that when 
So




The probability a student selected at random takes no more than 71.52 minutes to complete the examination equals 0.8997.
This means that when X = 71.52, Z has a pvalue of 0.8997. This means that when 
So




Since we also have that 





Question
The mean is 
The standard deviation is 
Answer:
The Cinema is equidistant from the Theater and the Museum
Step-by-step explanation:
<em>Refer to attachment</em>
- As per the graph, the three buildings are located on same line, the Cinema (2, 1) is in the middle and the Cinema is equidistant from the Museum (-3,-1) and the Theater (7,3):
- 2 - (-3) = 5 and 7 - 2 = 5
<u>Correct answer choice:</u>
- The Cinema is equidistant from the Theater and the Museum