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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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University Theater sold 556 tickets for a play. Tickets cost $22 per adultand $12 per senior citizen. If total receipts were $84
lawyer [7]
To find the answer, set up a system of equations.

Let x=adult tickets and y=senior citizen tickets.

x+y=556
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y=556-x

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Simplify and combine like terms.

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182 adult tickets were sold, so to solve for the number of senior citizen tickets sold, subtract 182 from 556.

556-182=374

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3 years ago
Anusha is walking on a hiking trail at a rate of Three-fourths miles in One-fourth hour. At this rate, how far will Anusha walk
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How do the expressions 72 divided and -72divided by (-9) and compare when they are evaluated?
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Complete question is;

How do the expressions 72 divided by 9 and -72 divided by (-9) compare when they are evaluated?

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D. They have the same value and the same sign

Answer:

D. They have the same value and the same sign

Step-by-step explanation:

For 72 divided by 9,it is;

72/9 = 8

Usually when we don't have any sign in front of a number, it is said to be positive.

Thus, the answer can be expressed as; +8

Also, when -72 is divided by (-9), it is;

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Similar to the first division, since no sign is attached to 8,it is said to be positive as +8.

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