Agroup of 55 pupils were asked if they owned a phone or a tablet.

11 people are known to own both

18 said they only owned a tablet

34 said they owned at least a phone

a student is picked a random, what is the probability that the student doesn’t have a phone or tablet? give your answer as a fraction in its simplest form.

select your answer from the list below:

a: 3/63

b: 3/55

c: 11/55

d: 18/55

it's B

Step-by-step explanation:

USE The venn diagram

11 said they own both devices so it will be in the middle

34 said they owned at least a phone

34-11 =23

.there can be infinite values of m and n that can satisfy the above equation. for each value of m of m or n. there maybe infinite sets of solution for the above

step-by-step explanation:

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;