Sam was asked to evaluate the expression 5x+3x+20 for X = 100. Sam's work shown below. Sam's work: 5x+3x+20 = 100 8x+20 = 100 8x
2 answers:
Answer:
The value of given expression for x=100 is 820.
He should substitute the value of x in the given expression instead of equating it to 100.
Step-by-step explanation:
The given expression is
Sam want to evaluate the expression 5x+3x+20 for x = 100.
Substitute x=100 in the given expression.
The value of given expression for x=100 is 820.
Sam make his mistake in first step. He equate the given expression to 100.
He should substitute the value of x in the given expression instead of equating it to 100.
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Answer:
2.87%
Step-by-step explanation:
We have the following information:
mean (m) = 200
standard deviation (sd) = 50
sample size = n = 40
the probability that their mean is above 21.5 is determined as follows:
P (x> 21.5) = P [(x - m) / (sd / n ^ (1/2))> (21.5 - 200) / (50/40 ^ (1/2))]
P (x> 21.5) = P (z> -22.57)
this value is very strange, therefore I suggest that it is not 21.5 but 215, therefore it would be:
P (x> 215) = P [(x - m) / (sd / n ^ (1/2))> (215 - 200) / (50/40 ^ (1/2))]
P (x> 215) = P (z> 1.897)
P (x> 215) = 1 - P (z <1.897)
We look for this value in the attached table of z and we have to:
P (x> 215) = 1 - 0.9713 (attached table)
P (x> 215) =.0287
Therefore the probability is approximately 2.87%
Answer:
6 km
Step-by-step explanation:
You use Pythagoras