Answer:
2
Step-by-step explanation:
There is 2 decimal places because you see how many numbers there are behind each of the decimals when multiplying then add them and that’s how many numbers are behind the decimal in the problem
It is a 50% chance. This is because 3 girls is half of the girls and 4 boys is half of the total boys.
Answer:
hdjydydytdytd
Step-by-step explanation:
Answer: There are 12 mountain bikes in the shop
Step-by-step explanation:
Total number of bikes in the bike shop =120
Percentage of mountain bikes =10%
Number of mountain bikes in the shop =10% of 120
=10% x 120
==0.1 x 120=12
Answer: the probability that no sections receive a hard test is 0.1022
Step-by-step explanation:
Given that;
total number of exams = 20
hard exams = 8
reasonable = 7
easy exam = 5
so total exams that are bot hard = 7 + 5 = 12
we will make use of the probability mass function of hyper geometric distribution;
so the probability that no section of the received a hard test can be determined as follows;
P( x=0; N=20, n=4, k=8 ) = [ ⁸C₀ × ²⁰⁻⁸C₄₋₀ ] / ²⁰C₄
= [1 × ¹²C₄ ] / ²⁰C₄
= [1 × (12!/(4!×(12-4)!) ] / (20!/(4!×(20-4)!)
= [1 × 495 ] / 4845
= 495 / 4845
= 0.1022
Therefore the probability that no sections receive a hard test is 0.1022