In one particular suburb, there are 12 families that own a bulldog. If there are a total

Mathematics

1 answer:

Lelechka [254]3 years ago

3 0

Answer: 30%

Step-by-step explanation:

There are 12 families that own a bulldog and there are total of 40 families that own a dog. Percentage of dogs owners with a bull dog can be written as:

Number of bulldog owners/Total number of dog numbers × 100

= 12/40 × 100

= 3/10 × 100

= 30%

The percentage of bulldog owners is 30%.

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Answer: B

Step-by-step explanation:

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3 years ago

The proportion of students who own a cell phone on college campuses across the country has increased tremendously over the past

galina1969 [7]

Complete Question

The complete question is shown on the uploaded image

Answer:

1 ) The correct option B

2) The correct option is C

3) The correct option is C

4) The correct option is C

Step-by-step explanation:

From the question we are told that

The proportion that own a cell phone is $p = 0.90$

The sample size is n = 15

Generally the appropriate distribution for X is mathematically represented as

$X \ is \ B( n , p )$

$X \ is \ B( 15 , 0.90 )$

Generally the number students that own a cell phone in a simple random sample of 15 students is mathematically represented as

$\mu = n * p$

$\mu = 15 * 0.90$

$\mu = 13.5$

Generally the standard deviation of the number of students who own a cell phone in a simple random sample of 15 students is mathematically represented as

$\sigma = \sqrt{ n * p * q }$