If 10% of a group ate sandwiches two days in a row, and 40% of the group had a sandwich on the first day, this means that 25% of the group that ate a first sandwich had a second. A. True B. False

Question

03-08-2017
Mathematics

contestada

If 10% of a group ate sandwiches two days in a row, and 40% of the group had a sandwich on the first day, this means that 25% of the group that ate a first sandwich had a second. A. True B. False

Respuesta :

Otras preguntas

The Fed Governors are unelected and have a tremendous amount of influence over the economy. Is this system compatible with a democratic form of government

HAPPY NEW YEAR EVERYONE. HERE IS TODAY'S OPTIONAL CHALLENGE What is 1567238932 * 1456788345 Try to do this on paper and not with a calculator. This is optional

a school has 1800 students 55 %of the students of girls. how many boys are in the school?

picture below/above.............. thanks

14. The figure shows a slice of an apple pie in the shape of a sector of a circle with centre O and radius 8cm. A cut is made along AB to remove some of the cru

Consumer complaints are frequently reported to the Better Business Bureau. In one year the industries with the most complaints to the Better Business Bureau wer

please urgent please i beg

what is the standard form of (x + 1 + i)(x + 1 − i)

Can someone please help me

Which statement is true about the graphed function? 3 O F(x) < 0 over the interval (-0, -4) O F(x) < 0 over the interval (-0, -3) O F(x) > 0 over the i

merlynthewhizz merlynthewhizz · Answer 1 · 2017-08-10T21:06:37+02:00

The problem can be represented on a Venn diagram, as shown below.

We have P(Day 1 ∩ Day 2) = 0.1 and P(Day 1) = 0.4
We can deduce that 30% of the group ONLY had sandwiches on Day 1 and there's 60% of the group ONLY had sandwiches on Day 2.

We obtain the value 60% = 0.6 from 100%-(10%+30%)=60%

We also can deduce that there 70% of the group that had sandwiches on Day 2

The proportion of people who ate sandwiches on Day 2 GIVEN that they ate sandwiches on Day 1 is given by

P(Day 1 ∩ Day 2)÷P(Day 2) = 0.1÷0.4 = 0.25 = 25%

The statement is TRUE