Answer:
A) 0.0107
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 440 seconds and a standard deviation of 40 seconds.
This means that
Find the probability that a randomly selected boy in secondary school can run the mile in less than 348 seconds.
This is the p-value of Z when X = 348. So
has a p-value of 0.0107, and thus, the correct answer is given by option A.
10 x 7 = 70
1 x 7 = 7
9 x 7 = 70 - 7
9 x 7 = 63
Answer:
48
Step-by-step explanation:
3/5=x/80
cross multiply
5x=240
x=48
Answer:
C: None of the above
Step-by-step explanation:
Answer:
Step-by-step explanation:
given
Heighr of fall S = 216m
Time taken t = 15seconds
Required
Acceleration
Using the equation of motion;
S = ut + 1/2at²
u = 0m/s
216 = 0 + 1/2a(15)²
216 = 225a/2
216 = 112.5a
a = 216/112.5
a = 1.92m/s²
Hence the rate of acceleration is 1.92m/s²