What number is between 7.5 and 8
1 answer:
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Answer:
The temperature decreased by 9 °F in <u>6 days.</u>
Step-by-step explanation:
Let the number of days it takes for the temperature to decrease by 9 °F be .
Given:
Average daily temperature decreases by °F.
Decrease of temperature in 1 day = = 1.5 °F.
∴ Decrease in temperature in x days is .
Now, as per question, decrease in temperature in 'x' days is 9 °F.
Therefore,
Therefore, the temperature decreased by 9 °F in 6 days.
Answer:
0.8749
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:
The probability that Z is less than 1.15 is:
This is the pvalue of Z = 1.15, which is 0.8749.