The most expensive one is 40 so u dont need to add that one in so add up 18 22 and 35 and you get 75. So he spent $75 at the store.
Answer:
The probability that a randomly selected boy in secondary school can run the mile in less than 302 seconds is 0.0107
Step-by-step explanation:
Consider the provided information.
It is given that mean is 440 seconds and standard deviation is 60 seconds.
z factor for less than 302 seconds would be: 
z = (302 - 440) / 60 = -2.3
The probability of getting a z factor of less than -2.3 = 0.0107 approximately.
looking up in the z-table for a z factor of -2.3.
The probability of a student running the mile in less then 302 seconds would be 0.0107.
Hence, the probability that a randomly selected boy in secondary school can run the mile in less than 302 seconds is 0.0107
Answer:
d. Of all possible samples of the same size, 20.79 percent will result in 85 percent of adult sea turtles on the beach being females.
Step-by-step explanation:
Hypothesis testing is conducted to test an observation against the null hypothesis. P-value is calculated to determine whether to accept or reject the null hypothesis. In the given case the p-value is 0.4158 which means null hypothesis is true.
Answer:
B
Step-by-step explanation:
If -10 is 10 seconds before he finishes his first lap, and 10 is 10 seconds after he finishes his first lap, whats in the middle of that?! 0 of course, so thats when he finishes his first lap.
Answer:
(x) = x + 7
Step-by-step explanation:
Let y = f(x) and rearrange making x the subject, that is
y = x - 7 ( add 7 to both sides )
y + 7 = x
change y back into terms of x, then
(x) = x + 7