1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
mixer [17]
3 years ago
7

20000 students took a standardized math test. The scores on the test are normally distributed, with a mean score of 85 and a sta

ndard deviation of 5. About how many students scored between 90 and 95?
Mathematics
1 answer:
Tpy6a [65]3 years ago
7 0

Answer: 2718

Step-by-step explanation:

Given: Mean score = 85

Standard deviation = 5

Let x be the score of a random student that follows normal distribution.

Then, the probability that a student scored between 90 and 95 will be

P(90< x < 95)\\\\=P(\dfrac{90-85}{5}

The number of students scored between 90 and 95 = 0.1359 x (Total students)

= 0.1359 (20000)

= 2718

Hence, The number of students scored between 90 and 95 = 2718

You might be interested in
Nancy's morning routine involves getting dressed, eating breakfast, making her bed, and driving to work. Nancy spends ⅓ of the t
devlian [24]

Answer: 26 minutes

Step-by-step explanation:

Assume that the total time spent in the morning which includes getting dressed, eating breakfast, making her bed, and driving to work is x.

Time getting dressed = ¹/₃x

Eating breakfast = 10 mins

Making bed = 5 mins

¹/₃x + 10 + 5 = 35 ½

¹/₃x + 15 = 35 ½

¹/₃x = 35 ½ - 15

¹/₃x = 20 ½

x = 20 ½ / ¹/₃

= 61.5 minutes

Total morning routine is is 61.5 mins

Time taken to drive to work is;

= 61.5 - 35 ½

= 26 minutes

8 0
2 years ago
To all who are good at math please help 80 points
sergejj [24]

Answer:

Number 4

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
If a bottle contains 16.9 fluid ounces and a person drank 80% of it how many fluid ounces did that person drink?
Verdich [7]
16.9×0.8= 13.52 fluid ounces
3 0
3 years ago
Read 2 more answers
Can you help with a please on 46
valentina_108 [34]
3/5
Thats if u devide 9 by 3 and 15 by 5
5 0
3 years ago
Read 2 more answers
Miss Berk has 8 pairs of pajama pants and 3 pairs of slippers. Three pairs of the pajama pants are Harry Potter themed and one p
shusha [124]

The probability that both items will be Harry Potter themed is 1/8.

<u>Step-by-step explanation:</u>

Total Number of pajama pants n(P) =8

Total number of slippers n(S)= 3

Number of Harry Potter themed Pajama pants n(H.P)=3

Number of Harry Potter themed slippers n(H.S)=1

We have to determine the probability of selecting pants and slippers that are both Harry Potter themed.

If two events A and B are independent, then the probability of A and B is given by

P(A and B)=P(A)*P(B)

Here the events selecting Harry potter themed pants and selecting harry Potter themed slippers are independent.

P(Harry\ Potter\ pants)=\frac{n(H.P)}{n(P)}

                                       =\frac{3}{8}

P(Harry\ Potter\ slippers)=\frac{n(H.S)}{n(S)} \\                                         =1/3

P(Harry\ Potter\ pants\ and\ Harry\ Potter\ slippers)=P(Harry Potter pants)\times P(Harry potter slippers)

=\frac{3}{8}\times  \frac{1}{3} =\frac{1}{8}

Hence probability of selecting Harry potter themed pants and Harry potter themed slippers is 1/8

3 0
3 years ago
Read 2 more answers
Other questions:
  • if there are 40 pieces of fuit in a bag and there are 3 . how many oranges would be be in 40 fruits if there are 6 pears
    8·1 answer
  • How do I do this exercise?
    15·1 answer
  • Write the expression in factored form: 16m4 power - n4 power
    5·1 answer
  • WHICH ONE DOESN'T BELONG? Which figure does not belong with the other three? Explain your reasoning.
    9·1 answer
  • .3 with a bar notation × 21
    10·1 answer
  • SOMEONE HELP ME ITS DUE IN 30 MINSS !
    6·1 answer
  • If a pair of standard dice are rolled, what is the probability that one of the dice will be a 3 and the other a 4?
    8·1 answer
  • the ratio of pink marbles to White Marbles Tamara's bag is equal to 1:5 what is the percent of pink marbles
    8·2 answers
  • A dolphin jumps out of the water. The function h=-16t^2+26t models the height (in feet) of the dolphin after t seconds. After ho
    6·1 answer
  • Х
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!