Which conjunction or disjunction is equivalent to the open sentence |a – 9| ≤ 4.
1 answer:
The absolute value inequality is equivalent to
±(a - 9) ≤ 4
When the minus sign is chosen and the expression is multiplied by -1, the comparison operator is reversed and the expression becomes
a - 9 ≥ -4
The solution spaces of
a - 9 ≤ 4
a - 9 ≥ -4
overlap, so the solution is the conjunction of the two inequalities. This matches selection ...
D. a - 9 ≤ 4 and a - 9 ≥ -4
±(a - 9) ≤ 4
When the minus sign is chosen and the expression is multiplied by -1, the comparison operator is reversed and the expression becomes
a - 9 ≥ -4
The solution spaces of
a - 9 ≤ 4
a - 9 ≥ -4
overlap, so the solution is the conjunction of the two inequalities. This matches selection ...
D. a - 9 ≤ 4 and a - 9 ≥ -4
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Answer:
97.72% probability that their mean body temperature is greater than 98.4degrees° F.
Step-by-step explanation:
To solve this question, we have to understand the normal probability distribution and the central limit theorem.
Normal probability distribution:
Problems of normally distributed samples 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.
Central limit theorem:
The Central Limit Theorem estabilishes that, for a random variable X, with mean and standard deviation
, the sample means with size n of at least 30 can be approximated to a normal distribution with mean
and standard deviation
In this problem, we have that:
If 36 adults are randomly selected, find the probability that their mean body temperature is greater than 98.4degrees° F.
This is 1 subtracted by the pvalue of Z when X = 98.4. So
By the Central Limit Theorem
has a pvalue of 0.0228
1 - 0.0228 = 0.9772
97.72% probability that their mean body temperature is greater than 98.4degrees° F.
Given 
you can find a_6:
Answer: -1
Answer: -1