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Andre45 [30]
4 years ago
11

In a multiple choice exam, there are 5 questions and 4 choices for each question (a, b, c, d). Nancy has not studied for the exa

m at all and decides to randomly guess the answers. What is the probability that:
(a) the first question she gets right is the 5th question?


(b) she gets all of the questions right?


(c) she gets at least one question right?


What is the area under the standard normal distribution for each region?


(a) Z< -1.65


(b) Z>1.5


(c) -1.1

(d) |Z|>1.3
Mathematics
1 answer:
morpeh [17]4 years ago
8 0

Answer:

a) 0.079

b) 0.001

c) 0.763

Step-by-step explanation:

The probability of answering wrong is 3/4=0.75.

The probability of answering right is 1/4=0.25.

a) The probability that the first question she gets right is the fifth question.

This mean that the first four questions are answered wrong.

Then

P=0.75^4*0.25=0.3164*0.25=0.0791

b) The probability that she gets all of the question right

P=0.25^5=0.001

c) The probability that she gets at least one question right. We can calculate that by substracting from 1 the probability that she gets all wrong.

P=1-0.75^5=1-0.2373=0.7627

Area under the standard normal distribution for each region:

a) P(Z<-1.65)=0.04947

b) P(Z>1.5)=0.06681

c)  P(Z<-1.1)=0.13567

d) P(|Z|>1.3)=0.1936

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URGENT!
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Answer:

The answer to your question is:  9.01 x 10⁸ ice cream cones

Step-by-step explanation:

Data

# of ice cream cones = 1700

5.3 x 10 ⁵ minutes ---------- 1 year

# of ice cream cones purchased in one year = ?

                              1700  cones ---------------------  1 min

                                 x                ----------------------  5.3 x 10 ⁵ minutes

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In scientific notation

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4 years ago
The area of parallelogram is 60 ft2.The height is 5ft. How long is the base?
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Answer:

b = 12 ft

Step-by-step explanation:

Given Data:

Height = h = 5 ft

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base = b =?

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3 years ago
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