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4 years ago

Please help someone

Mathematics

1 answer:

Ilia_Sergeevich [38]4 years ago

6 0

23.

Area formula of a triangle:

given: base = 9 cm height = 4 cm

A = 1/2 bh

=1/2(9)(4)

=18 cm²

24.

given: probability of rain - 0.03

of no rain - ?

1 - 0.03 = 0.97

25.

Volume formula of a cuboid:

V = length x base x height

= 6 x 4 x 2.5

= 60 cm³

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What is the Law of Exponents?

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Answer:

The exponent of a number says how many times to use the number in a multiplication.

Example:

$8^{2}$ = 8 × 8 = 64

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3 years ago

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3 years ago

In a recent survey in a Statistics class, it was determined that only 70% of the students attend class on Fridays. From past dat

pishuonlain [190]

Answer:

a) 67.6% of students is expected to pass the course

b) 0.9112 = 91.12% probability that he/she attended classes on Fridays

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

$P(B|A) = \frac{P(A \cap B)}{P(A)}$

In which

P(B|A) is the probability of event B happening, given that A happened.

$P(A \cap B)$ is the probability of both A and B happening.

P(A) is the probability of A happening.

a. What percentage of students is expected to pass the course?

88% of 70%(attended class)

20% of 100 - 70 = 30%(did not attend class). So

$p = 0.88*0.7 + 0.2*0.3 = 0.676$

0.676*100% = 67.6%

67.6% of students is expected to pass the course.

b. Given that a person passes the course, what is the probability that he/she attended classes on Fridays?

Here, we use conditional probability:

Event A: Passed the course

Event B: Attended classes on Fridays.

67.6% of students is expected to pass the course.

This means that $P(A) = 0.676$

Probability that passed and attended classes on Friday.

88% of 70%

This means that:

$P(A \cap B) = 0.88*0.7 = 0.616$

Then

$P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{0.616}{0.676} = 0.9112$

0.9112 = 91.12% probability that he/she attended classes on Fridays

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3 years ago

Mike is saving money earned from a job. For every $20 Mike earns, he puts $4 into savings. Mike is going to graph his savings. T

madreJ [45]

The first thing we must do for this case is to define the variables:
x = the amount earned
y = the money saved
The equation of the line that adapts to this problem is given by:
y = (1/5) x
Let's check:
For x = 20 $ we have:
y = (1/5) (20)
y = 4 $
Answer:
The slope of Mike's graphed line will be:
B) 1/5

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3 years ago

Read 2 more answers

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Juli2301 [7.4K]

Height of the stack = 3 fourth of an inch

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