Plz help will give u braniest, solve all

-1-3= A. -5 B. 2 C. -4 D. 4

Xelga [282]

Answer:

-4

Step-by-step explanation:

subtracting form a negative will result in a negative number

7 0

4 years ago

Read 2 more answers

The amount of time it takes for a student to complete a statistics quiz is uniformly distributed (or, given by a random variable

laiz [17]

Answer:

(a) The probability that a student requires more than 51 minutes to complete the quiz is 0.1667.

(b) The probability that a student completes the quiz in a time between 35 and 42 minutes is 0.2917.

(c) The probability that a student completes the quiz in exactly 41.84 minutes is 0.0417.

Step-by-step explanation:

Let X = amount of time it takes for a student to complete a statistics quiz.

The random variable X is uniformly distributed with parameters a = 31 minutes and b = 55 minutes.

The probability density function of X is:

$f_{X}(x)=\frac{1}{b-a};\ a$

(a)

Compute the probability that a student requires more than 51 minutes to complete the quiz as follows:

$P(X>51)=\int\limits^{55}_{51} {\frac{1}{55-31}}}\, dx=\frac{1}{24} |x|^{55}_{51}=\frac{55-51}{24}=0.1667$

Thus, the probability that a student requires more than 51 minutes to complete the quiz is 0.1667.

(b)

Compute the probability that a student completes the quiz in a time between 35 and 42 minutes as follows:

$P(35$

Thus, the probability that a student completes the quiz in a time between 35 and 42 minutes is 0.2917.

(c)

Compute the probability that a student completes the quiz in exactly 41.84 minutes as follows:

Apply continuity correction as follows:

P (X = 41.84) = P (41.84 - 0.50 < X < 41.84 + 0.50)

= P (41.34 < X < 42.34)

$=\int\limits^{42.34}_{41.34} {\frac{1}{55-31}}}\, dx=\frac{1}{24} |x|^{42.34}_{41.34}=\frac{42.34-41.34}{24}=0.0417$

Thus, the probability that a student completes the quiz in exactly 41.84 minutes is 0.0417.

8 0

3 years ago

Peg and Larry purchased “no contract” cell phones. Pegs phone costs $25 plus $0.25 per minute. Larry’s phone cost $35 plus $0.20

marissa [1.9K]

Let x be the number of minutes Peg and Larry used their phones. So their costs can be written as:

Cost of Peg's Phone usage = 25 + 0.25x
Cost of Larry's Phone usage = 35 + 0.20x

We are to find when the Peg's phone will be more than Larry's phone. We can set up the inequality as:

25 + 0.25x > 35 + 0.20x

Re-arranging the inequality

0.25x - 0.20x > 35 - 25

0.05x > 10

x > 10/0.05

x > 200

Thus, Pag's phone will cost more if the number of minutes of phone usage is more than 200

5 0

4 years ago

Drive Down is a racing video game. The game gives each player an initial amount of $5,000 in virtual money. After that, a player

mestny [16]

3rd is definitely D.

4 0

3 years ago

Isabel bought a new jacket for $48 before tax. She paid 6.5% in sale tax. How much was the sale tax??

ExtremeBDS [4]

The answer is $3.12 in sales taxes and a total of $51.12. Hope I helped! please rate me as the brainliest!

5 0

3 years ago