In science class, the girl to boy ratio is 3 to 7.
2 answers:
Answer:
There are 35 boys in the class.
Step-by-step explanation:
This question can be solved as a rule of three.
In science class, the girl to boy ratio is 3 to 7.
This means that for each 10 students, 7 of them are boys and 3 are girls.
So if for 10 students, 7 of them are boys, how many are boys for 50?
7 boys - 10 students
x boys - 50 students
There are 35 boys in the class.
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Answer:
4.05% probability that a randomly selected adult has an IQ greater than 123.4.
Step-by-step explanation:
Problems of normally distributed samples are 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.
In this question, we have that:
Probability that a randomly selected adult has an IQ greater than 123.4.
This is 1 subtracted by the pvalue of Z when X = 123.4. So
has a pvalue of 0.9595
1 - 0.9595 = 0.0405
4.05% probability that a randomly selected adult has an IQ greater than 123.4.