Ask question

Ask question

All categories

3 years ago

9

Scores on an exam are normally distributed with a mean of 67.5 and a standard deviation of 10. Find the percent of the scores th

at satisfy each question.
a)Less than 32

b)At least 70

c)Between 56 and 66

1 answer:

lozanna [386]3 years ago

6 0

Answer:

C

Step-by-step explanation:

You might be interested in

Solve the system of equations. x+2y=6; 3x-14y=8 please help

ira [324]

Let x = 6 = 2y so
3(6 - 2y) + 14y = 8 so
18 - 6y + 14y = 8 so
8y = -10 and
$y = \frac{ - 10}{8} = - \frac{5}{4} \\ \\ since \: x = 6 - 2y \\ 6 - 2( \frac{ - 5}{4}) = x \: so \\ x = 6 + \frac{10}{4} = \frac{24}{4} + \frac{10}{4} = \frac{34}{4} = \frac{17}{2}$

8 0

3 years ago

Tom has 2 feet of wire. He uses of the wire to hang a picture. How much wire did he use to hang the picture?

Ipatiy [6.2K]

Answer:

D. 1 1/2 feet

Step-by-step explanation:

<u>Multiply the numbers to find the length of wire used.</u>

2 1/2 × 3/5 =
5/2 × 3/5 =
3/2 =
1 1/2 feet

Correct choice is D

3 0

2 years ago

(a) Show that y Superscript 8 Baseline plus x minus 3 equals 0 is an implicit solution to StartFraction dy Over dx EndFraction

Nitella [24]

Answer:

a

Step-by-step explanation:

8 0

3 years ago

Eight less than four times a number is the same as 13 more than the number. What is the number?

Bas_tet [7]

4n - 8 = n + 13
4n - n = 13 + 8
3n = 21
n = 21/3
n = 7....the number(n) = 7

6 0

3 years ago

The late fee for library books is $2.00 plus 15 cents each day for a book that is late.If Maria's fee for a late book was $3.20,

tekilochka [14]

First we will subtract $2 from $3.2 since that is late fee to get $1.2.

Now we divide $1.2 by $0.15 to get number of cents hence 8 days.

The answer is Maria is 8 days too late to hand over the book.

Hope this helps.

5 0

3 years ago