from machine import Pin, I2C
import ssd1306

OLED_WIDTH = 128
OLED_HEIGHT = 64
SCL_PIN = 22
SDA_PIN = 21

i2c = I2C(-1, scl=Pin(SCL_PIN), sda=Pin(SDA_PIN))
oled = ssd1306.SSD1306_I2C(OLED_WIDTH, OLED_HEIGHT, i2c)

numbers = [15, 16, 18, 19, 20]

mean = sum(numbers) / len(numbers)
std_dev = (sum((x - mean) ** 2 for x in numbers) / len(numbers)) ** 0.5

oled.fill(0)
oled.show()

oled.text("Mean: {:.2f}".format(mean), 0, 0)
oled.text("Std Dev: {:.2f}".format(std_dev), 0, 20)

oled.show()