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pentagon [3]
3 years ago
6

"In one statistics course, students reported studying an average of 9.92 hours a week, with a standard deviation of 4.54. Treati

ng this class as the population, what percent of students study more than 8 hours? (Round z score to two decimal places.)"
Mathematics
1 answer:
Rudik [331]3 years ago
3 0

Answer:

66.28% of students study more than 8 hours

Step-by-step explanation:

The percent of students study more than 8 hour can be calculated as

P(X>8)=?

P(X>8)=P((X-mean)/sd>(8-9.92)/4.54)

The calculated z-score is -0.42.

P(X>8)=P(Z>-0.42)

P(X>8)=P(0<Z<-0.42)+P(0<Z<∞)

P(X>8)=0.1628+0.5=0.6628.

Thus, 66.28% of students study more than 8 hours.

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Answer:

To find the transformation, compare the function to the parent function and check to see if there is a horizontal or vertical shift, reflection about the x-axis or y-axis, and if there is a vertical stretch.

Parent Function:  g ( x )= | x | Horizontal Shift: Right  4  Units

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7

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Step-by-step explanation:

5 0
3 years ago
250 students were asked to choose their favorite color. How many more students chose purple than red as their favorite color? 26
nevsk [136]

Answer:

10 more students chose purple than red as their favorite color

Step-by-step explanation:

Step 1

Determine the proportion of students that chose each color

purple=26%

red=22%

Step 2

Use the expression for the number of students per color as follows;

Number of students per color=proportion per color×total number of students

for purple;

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total number of students=250

replacing;

Number of students that chose purple=(26/100)×250=65 students

for red;

proportion that chose red=22%

total number of students=250

replacing;

Number of students that chose purple=(22/100)×250=55 students

Step 3

Difference=65-55=10

10 more students chose purple than red as their favorite color

6 0
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Ahat [919]

Answer:

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Step-by-step explanation:

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i hope u found this helpful.

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2 years ago
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