A room measures 15 ft by 20 ft by 10 ft. If a basketball has a diameter of 9.6 inches, approximately how many basketballs will b
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Answer:
The estimate for the number of students who took the test is 23.
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
68% of the measures are within 1 standard deviation of the mean.
95% of the measures are within 2 standard deviation of the mean.
99.7% of the measures are within 3 standard deviations of the mean.
In this problem, we have that:
Mean = 78
Standard deviation = 6
Since the normal distribution is symmetric, 50% of the students had scores above the mean and 50% had scores below the mean.
Proportion of students who scored between 72 and 90:
72 = 78 - 6
So 72 is one standard deviation below the mean.
Of the 50% of the students who scored below the mean, 68% scored above 72.
90 = 78 + 2*6
So 90 is two standard deviations above the mean.
Of the 50% of the students who scored above the mean, 95% scored below 72.
Then
0.68*0.5 + 0.95*0.5 = 0.815
81.5% of the students scored between 72 and 90.
Nineteen students had test scores between 72 and 90. Estimate the number of students who took the test.
19 is 91.5% = 0.815 of the total number of students.
How much is 100% = 1?
19 - 0.815
x - 1
Rounding to the nearest whole number
The estimate for the number of students who took the test is 23.
Answer:
2(8x)+5(8)
8
Step-by-step explanation:
The computation of the number that should go to finished the expression is as follows:
Given that
Kali earns $ 8 per hour.
If she worked for n hours so it would be $8n
And she worked on both monday and tuesday for x hours
So, the x hour earning is $8x and for both days it would be $2 (8x)
In addition to this, she worked 5 hours on thursday
So her earnings on thursday is 5×8=40
So, the total earning for the week is
2(8x)+5(8)
