What is the value of 1 x ÷ 5, when x = 80? enter your answer in the box.
2 answers:
Answer: The required value of the expression at x= 80 is 16.
Step-by-step explanation: We are given to find the value of the following expression when x = 80 :
To ind the value of expression (i) at x = 80, we must substitute the value of x in the expression.
From expression (i), we get
Thus, the required value of the expression at x= 80 is 16.
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Answer:
The proportion of children that have an index of at least 110 is 0.0478.
Step-by-step explanation:
The given distribution has a mean of 90 and a standard deviation of 12.
Therefore mean, = 90 and standard deviation,
= 12.
It is given to find the proportion of children having an index of at least 110.
We can take the variable to be analysed to be x = 110.
Therefore we have to find p(x < 110), which is left tailed.
Using the formula for z which is p( Z < ) we get p(Z <
= 1.67).
So we have to find p(Z ≥ 1.67) = 1 - p(Z < 1.67)
Using the Z - table we can calculate p(Z < 1.67) = 0.9522.
Therefore p(Z ≥ 1.67) = 1 - 0.9522 = 0.0478
Therefore the proportion of children that have an index of at least 110 is 0.0478