Answer:
3.145 Hours
Step-by-step explanation:
37÷2=18.5
18.5×.17=3.145
Step-by-step explanation:
42 people are male
34 people study biology
14 people are male and study biology
42/90 = 46.7% are male
34/90 = 37.8% study biology
14/90 =15.6% are male that study biology.
Answer:
11a. 15x + 6
11b. x + 8 < 16 or x + 8 - 16
12. 3x + 15 + 5x = 8x + 15
13. 7x + 31
Step-by-step explanation:
Answer: 2.5
Step-by-step explanation:
Let
be the population mean .
Then, Null hypothesis : 
Alternative hypothesis : 
We assume that this is a normal distribution.
Given : Sample size : n=25 , since the sample is small (n<30) so we cannot apply z-test . Thus the test is t-test.
Sample mean : 
Population standard deviation : 
The test statistic for population mean is given by :-

i.e. 
Hence, the observed critical value = 2.5