Scores on an achievement test had an average of 70 and a standard ...

[brutforce]

Scores on an achievement test had an average of 70 and a standard deviation of 10 . Serena's score was 85 . Assuming the scores have approximately a normal distribution, about what proportion of students scored lower than Serena?
 a. 0.93
  b. 0.07
  c. 0.84
  d. 0.68

Question 2

For each study, decide if the two samples are independent samples or paired samples. A group of 100 students were randomly assigned to receive vitamin C (50 students) or a placebo (50 students). The groups were followed for 2 weeks and the proportions of students with colds were compared.
 a. Independent samples
  b. Paired samples

[tofugiraffe]

Answer to Question 1

A

Answer to Question 2

A

[brutforce]

Gracias!

[Animal_Goddess]

Thanks for the timely response, appreciate it