Answer:
Z scores of -2 or lower are considered unusually low. Since the z-score of a 49-cm head circunference is -2, it is an unusual measure.
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.
Z scores of -2 or lower are considered unusually low, and zscores of 2 or higher are considered unusually high.
In this problem, we have that:
49cm head circunference unusual?
Z scores of -2 or lower are considered unusually low. Since the z-score of a 49-cm head circunference is -2, it is an unusual measure.
For the first equation, you start at 0 and go by 30. The second one you start at 125 then go up gradually by 20 like you did for the first equation. Hope it helped
Answer:150 square inches
Step-by-step explanation:
I do not understand your question, however if it is one hundred ninety, then the answer is 190.00
Answer:
300 girls
Step-by-step explanation:
100% represents the whole school
To calculate this amount divide 99 by 33% to find 1% and multiply by 100
school population = × 100 = 3 × 100 = 300