A scientist measured the mass of 9 samples of a substance. The data is shown in the table.
1 answer:
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Answer:
72.91%, that is, approximately 73% of medium-sized dogs have a heart rate that is lower than Scooter's
Step-by-step explanation:
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.
In this problem, we have that:
Lower than 126 beats per minute
pvalue of Z when X = 126. So
has a pvalue of 0.7291
72.91%, that is, approximately 73% of medium-sized dogs have a heart rate that is lower than Scooter's