Step-by-step explanation:
According to normal distribution curves following a bell curve formula, it is followed that
34% of people will lie between Mean point and one positive standard deviation
34% of people will lie between Mean point and one negative standard deviation
14% of people will lie between Mean point and two positive standard deviation
14% of people will lie between Mean point and two negative standard deviation
2% of people will lie between Mean point and three positive standard deviation
2% of people will lie between Mean point and three negative standard deviation
Now following this principle, we are given that mean score is 80 and standard deviation is 8, hence the interval for grades would be;
Grade A ; Score greater than 96
Grade B : Score greater than 88 and less than or equal to 96
Grade C : Score greater than 80 and less than or equal to 88
Grade D : Score greater than 72 and less than or equal to 80
Grade E : Score greater than 64 and less than or equal to 72
Grade F : Score less than 64
16 wide
Step-by-step explanation:
because i do 8 x 2
Hello there! I can help you! The formula for compound interest is P(1 + r)^t, where P= principal (initial amount), r = interest rate (in decimal form), and t = time (in years). Let's do this step by step. First off, we add the rate into 1. 4% is the interest rate (0.04 in decimal form). 1 + 0.04 is 1.04. Now, what we will do is raise that number to the 2nd power, because the time that elapses is 2 years. 1.04² is 1.0816. That's that. Now, multiply 7,500 to find the total amount of money. 1.0816 * 7,500 is 8,112. There. Toby's savings account balance in 2 years is £8,112.
Note: To solve for compound interest questions like it, add 1 to the percentage rate in decimal form, raise that number to a power based on the number of years (for example, raise the number to the 7th power if we are looking for the balance after 7 years), and then multiply that number by the starting amount. After you raise the number by a power, there may be a lot of numbers behind it. Whatever you do, DO NOT delete the number. Keep it there and multiply it by the principal.
Answer:
32/4
simplified is 8/1
Step-by-step explanation:
