One kilogram of cheese costs £5.60
jane buys 200g of cheese
work out how much she pays

Jane pays £1.12 for 200g of cheese

Step-by-step explanation:

1kg = 1000g = £5.60

200g = x

x = (200 × 5.60)/1000

x = 1120/1000

x = £1.12

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;