Can someone help me with circles plz

Mathematics

1 answer:

Brilliant_brown [7]2 years ago

7 0

Answer:

Step-by-step explanation:

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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

Elina [12.6K]

Answer: a) 0.07910, b) 0.000976, c) 0.7626

Step-by-step explanation:

Since we have given that

Number of questions = 5

Number of choices = 4

P(getting correct) = $\dfrac{1}{4}=0.25$

a) the ﬁrst question she gets right is the 5th question?

P(getting 4 wrongs answers and one right answer) is given by

$(1-0.25)^4\times 0.25\\\\=0.75^4\times 0.25\\\\=0.07910$

b) she gets all of the questions right?

P(all right )= $0.25^5=0.000976$

c) she gets at least one question right?

1-P(All of them wrong)

$=1-(1-0.25)^5\\\\=1-0.7565\\\\=1-0.2373\\\\=0.7626$

Hence, a) 0.07910, b) 0.000976, c) 0.7626

8 0

2 years ago

The marketing department of a sports supply store wants to estimate the percentage of adults in the town who belong to a gym. Wh

Oxana [17]

Since we want to estimate the percentage of adults in the town who belong to a gym. We should take a random sample from the town itself because a store’s adult customers, or their friends, or first 20 customers every day for one week, or adults at the local park might not represent better sample for survey.

Therefore, Take a random sample of adults in the town, and ask each person whether he or she belongs to a gym. Calculate the percentage of the total who say “yes.”

Hence, option D describes a method that will help the marketing department accurately estimate this percentage.

7 0

2 years ago

A ball is shot upward from a slingshot at a velocity of 15 m/s the height of the ball after t seconds is given by h(t)=10+ 5t+1/

otez555 [7]

Answer:

The instantaneous velocity after eight seconds is 9 m/s

Step-by-step explanation:

Given as :

The ball shot upward with velocity of 15 m/s

The height of the ball after t sec is given as h(t) = $10 + 5t + \frac{1}{4}t^{2}$